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Machine-Translated by:
- Archbishop of Gilt
Proofread by:
- Archbishop of Brawn
Japanese-English Checking by:
- Archbishop of Indignation
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――Right from the very beginning, there was only ever one ending that the Witch of Tristitia, Petra Leyte, had needed to aim for, strive towards, and ultimately arrive at.
That was from before she had ever become the Witch of Tristitia, from back when Petra Leyte, a mere village girl, had ended up reading the outrageous artifact that was Natsuki Subaru’s Book of the Dead.
From back when she had first learned that Natsuki Subaru, in exchange for his own Death, had been fighting in a constant struggle in order to alter the fates of countless people.
From back when she had fallen in love with Natsuki Subaru through their ordinary, quiet days together, discovering what brought him joy, what made him grieve, and what caused him to feel happiness and sorrow.
――Taking all those varied reasons, gathering them together, bundling them up, and collecting them all into one, she had made her decision.
Petra: [Because no matter what, Subaru still wants to do something about Al-san, right?]
Honestly, from Petra’s point of view, it was an unthinkable idea.
If one were to count up all the things Al had done on their fingers, not even all the digits on their hands and feet would be enough to list everything, so they would need to go as far as using the Unseen Hand to enumerate the rest of what the hands and feet had been unable to.
To that extent, Al had done enough irreversible things to fill a mountain. ――But even so, she did not believe that at heart, Al was a heinous villain who had done all of that while scorning everything.
Petra: [I wonder, is this the influence of being corrupted by Subaru’s book…?]
It might not be her place to say it, but Petra was a realist, and the extent of what she could handle was limited. Rather than just limited, it was more accurate to say she deliberately kept it limited.
After all, if she were to use her abilities to their fullest extent, her vessel would have been capable of carrying an extraordinary amount of things, a fact which Petra took great pride in. She would not feel ashamed of that.
However, using her vessel to its limits, she did not believe that she would be able to treasure everything that she could cram into it.
And yet――,
Petra: [Subaru’s greediness…]
But, that’s what I like about him. ――That’s wrong. It’s part of what I like about him.
And so, because that Natsuki Subaru could not be changed, Petra Leyte would do it.
It was a painful decision, one that seemed to cut deep into her, as if mercilessly ripping her heart to shreds.
――By making Natsuki Subaru Return By Death, she would reset everything that had happened.
From the moment she made the decision to leave the Pleiades Watchtower and journey alongside the Imaginary Subaru, Petra Leyte had been forging ahead towards that ending.
She had firmly insisted on becoming the holder of the Witch Factor of Tristitia, taking it upon herself to pay most of the compensation, save a small few exceptions, that came with wielding the Authority. She had not spared any card she could play in the negotiations, and provided all of the information she could share, thereby plotting the course for the Aldebusters.
Petra: [If me reading the book is what caused the Witch of Envy to go on a rampage―― then, I’ll be able to use that too, right?]
Ever since the Sin Archbishop of Gluttony, Roy Alphard, was released from the prison tower, and the effects of his Authority became clear to her, a certain suspicion had sprouted within Petra. ――Having read the Book of the Dead, if Petra were to be dispossessed of her Memories, just what verdict might the Witch of Envy pass?
Then, she also wondered if this was perhaps the very strategy Al had aimed to use in order to make the Witch of Envy withdraw, since he had claimed to have no intention of destroying the world.
Hence, when Roy Alphard was defeated by the combined might of the Aldebusters, while he was tied up and barely clinging onto life, she had made a promise with him.
Petra: [If you want to eat me, I’ll give you a chance.]
Of course, this was a promise she intended to break without remorse if he had not been willing to keep it.
Corrupted by Natsuki Subaru, Petra had become an outlaw who bore no reservations whatsoever about breaking the promises she had made with people she disliked.
Moreover, in preparation for when that unlikely event came to pass, she had secured a reliable ally.
Petra: [Rem-neesama, is truly amazing.]
With sincerity, even when setting aside the tremendous bias from Natsuki Subaru’s influence, she believed this.
Rem had uncovered Subaru’s Return by Death―― back then it was “Turning Back Time”, but even if the impetus for that was Rom-jii explaining the true nature of Al’s Authority, she had pieced it together on her own.
On her own, Rem had come to the realization that Natsuki Subaru was a person who had always continued to fight by sacrificing his own life. ――Though the thought of that had made her happy, she also felt devastated.
Petra: [But, that’s why I can entrust it to Rem-neesama… No, I can’t entrust it to anybody but Rem-neesama.]
No matter how many wonderful things happened along the way, no matter how many unrelinquishable feelings she gained, Petra Leyte had resolved herself to overturn everything, and make it so that none of it had ever happened.
And true to that, even Rem, who had at long last regained her Name and Memories, and had thus truly returned home to them all, would be erased and disappear.
Knowing that full well and still determined to go through with it, Petra had an obligation to get Rem involved.
They were kindred souls that knew they were going to be erased, who in spite of that, were fellow women who, from the bottom of their hearts, wished for the person they loved most to not lose even a single thing.
She could have only ever entrusted this to someone who truly believed that there was no other way, one who was willing to give up everything for love.
Such a terrible thing could have never been entrusted to someone who, if they believed a better solution might exist somewhere, would relentlessly search for it until the very last moment.
That was why Petra and Rem were the ones who would carry this through.
Petra: [Subaru, Emilia-neesama, I know you must be so tired. I’m sorry. But I’m going to wind up being a burden too. I’m sorry. All the thanks I’d wanted to say could never be enough…]
Thank you, thank you in the truest sense of the word: that is what she had wished to convey.
Knowing everything that she did from having read the Book of the Dead, Petra Leyte had wished to assist both Emilia, who was walking down a thorny path, and Natsuki Subaru, who had chosen to work himself to the bone in order to support her.
That would not come true. No matter how hard she tried, Petra Leyte would always be a mere village girl who knew absolutely nothing at all.
That would be frustrating, it would be miserable, and no matter how many thank you’s and sorry’s she said, it would never be enough.
Even so――,
Petra: […I wonder, did I really do everything I could?]
Given the constraints in her situation, had she not done the absolute extent of what she was capable of?
Al had prepared an all-star lineup to ensure he would not lose, and yet she had only been granted a single chance of trial and error in order to overcome him; there were limits to how unfair it could be.
But she had done it. She had pulled it off. Though she had been a little taken aback when Otto, stripped of his memories, had joined the fray midway, but everything, every single bit, had been thanks to everyone joining together.
Petra: [Hehe, I’m pretty amazing, aren’t I? Think you’re going to fall for me now?]
???: [――. Yeah. Seems like I might.]
Slightly inclining her head, she greeted him with the cutest face she could put on.
At Petra’s adorable gesture and question, the Imaginary Subaru blushed in a shy manner. Was this just a deception that Petra had wanted him to say? Or, was it genuine enough that even the real him would actually say it?
Petra: [Well, since I’m about to disappear, I might as well interpret it in the way that’s most convenient for me.]
She gently reached out, placing her hand over his intangible one, entwining their fingers. A phantasmal perk to this degree, could surely be allowed. She had worked so hard, after all.
“Subaru”: [By the way, can I ask you something? I mean, it’s kind of weird for me to be asking, considering my position.]
Petra: [Hmm~? What is it?]
“Subaru”: [Even before Clind-san passed the Witch Factor down to you, just one time, Petra, you paid some compensation for the traversal… but you never told me what it was, did you? I’ve just been wondering what it could have been.]
Petra: [Since I didn’t tell you, why not just leave it at that?]
“Subaru”: [Don’t be so cruel!]
Even his pathetic expression looked cute, so Petra let out a small chuckle.
But as expected, imaginary or not, Subaru was still Subaru. Even if he was a resident of her mind, he would not take liberties with what Petra had kept hidden from him, those things which she did not wish for him to see or know.
Relieved by that, Petra stuck out her tongue in a playful manner and,
Petra: [It’s~a~secret!]
That made the Imaginary Subaru put on a sullen look, but Petra wanted to keep it a secret.
It should be fine to have at least one maiden’s secret that she would not show even to the Imaginary Subaru. And besides, this particular maiden’s secret had just a touch of girlish cunning.
Back then, to Clind, Petra had offered a certain possibility of hers as compensation.
That was――,
Petra: [――The possibility of me becoming Subaru’s bride.]
The surprise on Clind’s face when he learned of Petra’s resolve had been truly remarkable.
Bearing a weighty history as a dragonkin, the eyes with which Clind had looked upon Petra as she sacrificed that potentiality of hers, contained a reaction overcome with such deep emotion that she would never be able to forget it.
That was precisely why she had felt so apologetic. ――After all, it was that compensation that had convinced Petra.
Petra: [If I could offer that as compensation, then the possibility of that future truly does exist for me.]
Considering the abilities of the Witch Factor of Tristitia, it would be more accurate to say that Petra had offered up part of her ability to exert influence over the world, specifically, “the various efforts she would have needed to make in order to secure a future in which she married Subaru”. But, such details meant nothing to Petra at that moment.
What mattered was to believe in a future in which Petra Leyte would become Natsuki Subaru’s bride.
And that had been proven by none other than a Witch Factor, something that made contact with the very core of the world.
Because she had that evidence, she had resolved herself to see it through, and had thus been able to make it all the way to the end.
That was why――,
Petra: [Do your best, me. ――Whether or not I seize this chance, depends entirely on how hard I try!]
From the village girl who had become the Witch of Tristitia, utilizing even a Witch Factor for the sake of her own happiness, that was an earnest cheer directed toward her future self, one who would never become the Witch of Tristitia.
――It was the heavy-hearted cheer of love from a tough and determined girl from another world.
I’m glad that the great reset happened cuz if it didn’t happen petra would be crippled for life
Now the story is dead instead of Petra…
yeah 🙁
I don’t even think that’s true. She wouldn’t be living a happy life by any means, but I don’t think she’d be full veggie. Depends on what she personally paid for and what she had others pay for
The story was quite explicit in what she paid. I don’t know how you missed it.
No, it only said that she paid most of the compensations. The full list was given, not only the ones Petra paid. Inside the list were compensations that explicitly contradicted things she did seconds prior, such as “never call another by a term of affection” (would be violated when she refers to Frederica as “Nee-sama”). That means we do not explicitly know which or even how many of those compensations were paid by Petra.
I think that is just an ambiguous vow, it probably refers to not call them that way while on their presence; i.e., to never talk to them calling them that
First
Second rather
Not sure how I feel about the whole “real chance for the child Petra to marry Subaru” thing. Hopefully this would be referring to something years in the future, but I’m concerned it’s going to be a super creepy harem-type ending where Subaru ends up marrying a kid. I can tolerate a lot from this story, but child marriage is like 50 steps over the line lol.
lust route flashbacks
Fuck
Yeah that is really creepy
Tappei will touch all the kids, Subaru will continue to be crushed on by kids, and Ootsuka will continue to give them unnatural looking hips, and you will love it!
I mean, it’s a 5 year age gap in a fantasy setting. In a one sided romance at that. I really don’t see the issue.
Emilia is literally 100.
Yet her mental faculties are Meili tier….kinda makes you wonder who’s grooming who in the relationship….
Its fine. Rudeus was like 52 when Eris gave him his first time and no one cared. Subaru can wait a few years
diddy tensei
I’d like to think that “possibility” is doing a lot of heavy lifting here. It would take an absolutely absurd route for that to happen.
Maybe through political games, blackmail, magic, potions, authorities, or a post-RBD world where Rem and Emilia die when Subaru is in his sixties…
I just hope that whatever messed-up route would make that possible never gets explored.
Go be brown somewhere else
This lol
Honestly I don’t think that was what Tappei intended. I think it’s referring to a infinitesimal chance of them marrying as adults. Subaru is constantly explicitly stated to not be like *that* despite his title
Polygamy is allowed in that world, and 5 year difference in man’s favor will stop being an issue in, hm… Let’s see.
X/2+7=14+Y
X-Y=19
X=19+Y
(19+Y)/2+7=14+Y
…
Y=5
In 5 years Petra will be a suitable age to have proper relationship with Subaru.
How teachers/parents think we would use algebra for
Dude really used algebra for this. Please teach me bro
I don’t think the main story will ever slip into the R18 territory. Their age gap of five years looks almost cute compared to Emilia, Beatrice and Shaula. It is only an onesided love for now anyway. If Subaru unleashes his inner beast after a five year timeskip, I wouldn’t really be bothered.
On the other hand I would be concerned if Emilia was the only winning heroine in the end, Rem’s and Petra’s devotion should also be rewarded eventually.
But is kind of sketchy how much Subaru remembers from the reset world.
It’s just a hypothetical situation; it doesn’t imply it would happen right then. I honestly don’t understand how you took that as Subaru marrying a literal child.
Please stop with the lolicon shit
Its one sided bro. Child’s delusions
Clind’s fantasy novel is coming into reality
p diddy no p diddy no p clind clind Diddy hahahah (I’m 5 years old)
It’s one-sided until it isn’t
kids can and do have crushes that they think of marrying you know
Correct me if I’m wrong, but doesn’t this chapter contain another future trial line?
Also I swear someone made a Google sheets document with all the lines but I can’t find it rn
You’re right. It’s about Subaru and Emilia being tired, said by Petra
Westerners having a meltdown rn
I have no clue what this means
It means westies think this development is not gluttonous drinking
Basically, he is deflecting a morals problem by pretending it’s a culture problem.
It kinda is a culture problem though. Age of consent varies from place to place. I guarantee the average Japanese reader doesn’t find arc 9 Petra’s romance brain moments as repulsive as the average western reader does.
it is a culture problem. you can romanticize love without approving of this. romantisizing love is wrong in the first place. if we go by numbers, petra is already legal in more western countries than brown countries.
fyi im having a meltup
So, Tappei laugh to the fans who dreamed of changes in the overall plot and Emilia’s camp. At the beginning of 12 Arc, all members of Emilia’s camp, except for Subaru, Meili, and Rem, will be in exactly the same place as at the beginning of 5 Arc. A lot of important things that fans have been waiting for years will never happen. Tappei doesn’t want to change the status quo. I’ve lost all the expectations I had for Re:Zero. Surprisingly, Re:Zero’s main problem is that the author is a huge fan. He brought Re:Zero to the position he wanted long ago, and he doesn’t care what the fans want. Of course, there are many hardcore fans who now instantly changed their minds because they absolutely cannot accept that anything in Re:Zero is less than perfect.
Personaly I changed my mind because my taste changed to something else. Malazan Book of the Fallen is my favorite series and it has scenes that are darker then Re Zero and they stay in the main series unlike Re Zero.
This story about a man who can rewind time to save people from bad things had him rewind time to stop bad things?
Gee, this story is completely illogical.
Clone, compare this arc and, for example, the 4th one. You’ll understand what’s wrong. Or not…
Compare different arcs, with different circumstances that show different things about RBD.
Great strategy ig.
Tappei is the one writing the story not the fans. He had a lot of the story planned out from the start so obviously he is not going to completely change the story because of crybabies with zero media literacy who can’t understand narratives.
God forbid an author wants to make a story his way instead of giving into fan pressure
Well, you can think and like whatever you want. But an author constantly pandering to fans’ wishes and delusions would also be a problem.
Can’t say I don’t have mixed feelings about arc 9, but it had its hype moments.
That’s some straight-up “Roswaal in Arc 4 while he’s being eaten by bunnies” levels of reasoning. “Yeah, I may not see the future, but a version of me will! :D”
for real
You guys should realize she had already lost of most of her sense of self and now subconsciously driven by arc 4 Subaru, especially the one who was at most his self sacrificial state.
What i said like 15 chapters ago. “Murder is a habit” chapter should give a good idea of what happened to Petra’s mind after reading the book.
Woah woah woah Tappei, better dont go Mushoku Tensei route. Ik you’re friend with MT author and the guy himself is a creep irl (this dude basically fought trying to keep some scenes in LN which was about Rudeus doing pedo things in his past life and it did get removed by the editor) but don’t let him influence your. The Japanese society may have allowed CP legally till 2014-2015 but you’re a man distinctive from mobs so dont get influenced by your sick side of culture too, man.
They’d probably all be aged up in the finale. Which makes the Subaharem totally valid.
Tappei said he hate harem.
Ice said Tappei hate harem, meanwhile this chappy says harem haram
Narcissistically projecting your own shitty western inability to cope with fictional amoral characters and haphazard conclusions about other people’s motivations onto people you’ve never even met to create a strawman before literally talking to it in the second person like a child talking to a batman action figure is beyond parasocial. Could this be…. the sin archbishop of cringe?
just say you like kids…
“western” buddy liking children isn’t a cultural phenomenon
>Narcissistically projecting your own shitty western inability to cope with fictional amoral characters and haphazard conclusions about other people’s motivations onto people you’ve never even met to create a strawman before literally talking to it in the second person like a child talking to a batman action figure is beyond parasocial
Fucking this, especially with Heinkel. Literally Endeavor-tier cringe meltdowns.
Fucking hell, are you gonna ignore the fact fuckin Japan actually used to allow CP possessions?
So much glorious character development instantly annulled! Please don’t let it become a generic Isekai-Harem Tappei… ReZero shines best when it’s tragic and mysterious.
Tappei said he hates harems
And yet the will of the world itself is wishing for Petra’s success…..what could this meeeeean????
Tappei himself said he hates harems, and its kinda obvious that wont happen he literally made the lust route for that
Oh, the obligatory “Tappei said in an interview” comment.
Is there a problem with the author talking about his own series and genres?
With how he changes his mind and plans half of the times? Nah, it’s cool, believe what you want. It’s not my job to educate people on how editorship works.
Dislike =/= Hate, and Tappei changes his mind all the time. Hell he literally changed his mind while writing this arc if you check his author note for the final chapter.
Well, it is something that have low chances of being implemented if it is disliked by the author himself. That is the point.
Holy shit last three chapters are wild.
Petra truly does have a chance to win, pog. Al might actually be Subaru’s son or not. HoLY SHIT SUBARU IS BACK YAHOOOOOOO!
And Al has once again lost. We know his deal now too, to kill the witch.
And Subaru has admitted: he is not okay! Therapy is on the table. We have never been so back.
it’s so crazy how some people are immediately jumping to the most bad-faith assumptions and fears because of one girl’s feelings, one-sided as they are. I really, really liked Petra this arc, but no, Subaru is not going to fall in love with her even if she is important to him. Maybe things change in a few years when she’s of a more appropriate age, but this ain’t Mushoku Tensei guys, c’mon. Even in Lust IF I’m pretty sure she was depicted as being an adult, or at least certainly older than she is now.
Your right about the lust route, its just nobody actually read cuz so many people keep acting like Subaru is a lustful pervert who touches everything he sees in that route
You shouldve seen early WN Subaru. He wanted to see up Beatrice’s clothes.
The early WN Subaru is an idiot who calls a person he just met an NPC. I like it that way. Without that Subaru we wouldn’t have ep. 15-18 Subaru.
I don’t think this chapter crosses the gross line some commenters her are typing about. The series as a whole definitely does at points, but as far as this chapter goes, it’s just Petra’s perspective on the whole thing. A kid is allowed to have an unrequited love on a grown up, as long as Tappei doesn’t start writing Subaru to want to pursue it.
True and real
I’m not sure how people melting down over this got past the LN art for Capella and Liliana
They probably didn’t, nor did they get past Vollachia’s lolis.
Literally the entire time I was reading, I was only considering the possibility of marriage AFTER Petra grew up whenever it was brought up. Says more about the commenter that they saw it a certain other way hm? Writing an innocent crush by a teen with a tinge of trafic fantasy was pretty cool.
lugunica age of consent is higher than european aof
Unrelated but Setowi is a fucking pedo.
Vile thing to say about someone for no reason but aight
Normalfags get off my board
I sense no lies
No he’s not
Thought you said Subaru nevermind
He’s that guy on reddit, right?
He’s a mod, so I’m kinda inclined to say “yes”, but I also find the “diddy ahh” crashout here utterly absurd
So I’ll just give a non committal grunt
Only good thing he does is he makes colored LN art. Besides that he just likes the kids as much as a reddit mod lolicon would.
His Twitter profile background is loli hentai characters but beako and petra’s face cropped on them
You all really though Tappei would kill his writer’s training wheels huh? The amnesia brothers are here to stay and waste your time reading amnesia memory fuck up plotlines until this shit series ends.
Okay but like since Roy’s epic death got reset that makes him like the greatest archbishop and greatest villain ever, and basically you’re stupid.
-> consequences of Gluttony remain
Series is shit, keeps dragging it out.
-> consequences of Gluttony are undone by characters regaining their memories
Series is shit, no stakes.
Atp Re:Zero hate readers might be the stupidest specimen of people present on the entire internet.
I miss when Al was a badass and this arc wasnt a side story
It wasn’t a side story and Al was almost never a badass, he was constantly on the verge of losing and losing himself at the same time. Hell he just had a breakdown because he wasn’t able to get carried by his authority like regulus!
No, he was a badass. He doesn’t get carried by anti-softlock checkpoints like Subaru.
He gets carried so bad he can barely even think of doing anything without his authority! stop comparing that fraud to goatbaru
Regulus’ breakdown was over a variety of things, chief of them being his insecurity and ludicrous levels of pettiness.
Even with history erased, this arc was a wellspring of lore. I’m not necessarily happy with everything, but calling it a side story is pretty overblown, although it will depend on how much information Subaru actually gained in this loop.
3 chapters? Gluttonous reading tsu. Gluttonous posting tsu. Gluttony!
It is splendid ! Is it splendid ? Could it be splendid ? Isn’t it splendid ? It must be splendid, we’re saying it has to be splendid, because we say it’s splendid ! Gluttonous drinking ! Gluttony !
thx WCT !
LMAO Petra is so smart she is preparing her marriage in an alternate timeline !!! xD
That is a brilliant way to end the arc with a little hopeful note ! Go Petra !!! (But please do wait a few years jeez)
Thx for translation, for the last time : 3 Chapters a day is crazy ! Thx WCT !!!
It doesn’t take a genius to see that Petra and Subaru ain’t gonna happen guys.
Though Subaru will probably start treating her a lot more serious, knowing what she’s capable of.
A lot of you need to relax with the pedo claims, which I reckon stems from your self inserting as you read or any manner of other reasons.
the young ladies are all…well, young teens. Subaru is 18 or whatever as of this arc. So many people marry with much larger age gaps. Frankly speaking it would be weird for the young ladies to not fantasize romance and relationships at their age. From my perspective, there just isn’t anything remotely weird about it.
Just to tick off everyone, I hope Tappei writes an updated lust if’ story and indulges the most ludicrous harem ever imagined for our boy Subaru, go get em tiger.
This was a fun arc to read. Cheers to those who have enjoyed the ride.
It’s amazing how predictable the outcome has been from the start. I mean, Subaru facing Al with exactly same dialogue and Shamaking him a moment before he did.
The biggest red herring was the no-kill rule that made me believe the story can continue without the great reset if no important character died. Though with Petra turning herself into an abomination and others getting dropped by the territory was when the illusion got dispelled.
Every time I see Petra commenting about marry Subaru, I always thought she means in the future, don’t understand the people with the pedo claims. Beside 18 and 13, at least in my country, is a very common age gap, maybe they should stop inserting their 30+ age ass in the protagonist spot. Now consider this… Al is full human right, and probably Subaru son (or clone) so who could be the mother? It has to be human, so that only leaves Petra! Now reread this arc from Al perspective, fighting against mom and dad.
I thought everyone had the common sense to assume that she means in the future, but guess fuckin not!
Man Petra has been so awesome in this arc.
People freaking out over this whole Petra marriage thing is silly, its just childs delusions, a one-sided romantical love.
The nameless star was petra all along. We saw her light and now it’s forgotten as if it never shined in the first place.
Man, this kinda confirm why taboo should exist. Ngl I’m wondering what whdaaa and other spin-off writers thinking about this now,”we gonna protect Subaru”
It was obvious why the taboo exists but this is not one of those times, just look back at everything that Al caused and then think about this being a good example of why the taboo exists
Honestly, why was there even a reset? It has been days since Subaru was captured and being released means the crisis was averted and therefore there should be a new checkpoint. There are no consequences… In the past, Rem lost her memories because of a new checkpoint. There is no reason for there to not have been a new checkpoint immediately upon Subaru’s release. It doesn’t take into account the status of anybody other than Subaru.
Well, Subaru was literally killed the moment he went out of the ball, he wasn’t in a “safe point” precisely in which Satella could establish a checkpoint.
That is why he was killed as soon as he was unsealed, for the checkpoint to not update.
I think Tappei did an excellent job. A reset was inevitable. It is the MC’s power, right? He was sensing the emotions of teammates via Cor Leonius the whole time while sealed. Beako was active while sealed. It makes sense, given the MC’s power.
Complainers should write their own version of the WN. That way their head cannon becomes canon…in their WN version.
Petra really is a tough girl.
So the first thing she paid as compensation was the possibility of being Subaru’s bride. Through that compensation though, it also gave her hope and determination to not give up no matter what, since through confirmation of a witch factor that contacts Od Laguna the core of the world, she has a chance, a possibility of becoming Subaru’s bride.
I don’t see that happening unless a harem ending but it is possible and for that Petra will work hard to win.
All of Arc 9 really has been just Petra’s master plan increase her chances of becoming Subaru’s bride. She certainly has left an impact on him.