Reborn as Eren Yeager: The Gacha System

Eren didn’t decide alone, in the end, mostly because he never got the chance to.

"I’ll do it," Ymir said, three days after the binding requirements became known, standing in the doorway of the war tent with the particular stubborn set to her jaw that Eren had come to recognize as identical to her sister’s.

The room went silent.

"Absolutely not," Annie said, already on her feet.

"You don’t get to decide that for me." Ymir’s voice didn’t waver, though her hands, Eren noticed, were clenched tight enough to whiten her knuckles. "I’ve spent my whole life being something other people decided to use — leverage for Marley, a hostage, a lever to pull on my sister. This is the first time anyone’s actually asked me what I’d choose. I’m choosing this."

[System notification: New candidate detected — Ymir Fritz. Compatibility assessment initiated.]

[Compatibility: 71%. Lower than Eren Yeager’s projected 94%, but within viable threshold.]

"The numbers say I’m the better option," Eren said carefully, watching Annie’s fear war visibly with her sister’s determination.

"The numbers say you’re more likely to survive," Ymir shot back. "Not the only one who could. And you have a wife who’d have to bury you, and a war that needs you whole, and a family that already lost you once to a system none of you chose. I have — " her voice caught, just slightly, "I have a sister who finally got me back. If I do this and it works, I’m still here. Still her sister. Just carrying something extra now, the way you’ve carried something extra your whole life and still found a way to be exactly who you are underneath it."

Mikasa, watching the exchange with careful, assessing eyes, finally spoke. "Why does it have to be either of you? Why not spread the risk — find out if there’s a third candidate somewhere, buy more time?"

[Query acknowledged. Searching Coordinate-adjacent bloodlines within accessible range... No additional viable candidates detected within 90-day mission window.]

"There isn’t time," Historia said quietly. "The ship’s still coming. Every week we spend searching for a third option is a week closer to it arriving before we’re ready for either outcome."

They argued for two more days — careful, exhausting arguments that circled the same impossible math from every angle, until finally, Annie pulled Eren aside alone, away from the others, her composure cracking in a way he’d rarely seen from her.

"Talk her out of it," she said, voice raw. "She’ll listen to you. She trusts you more than almost anyone, after what you did to get her out of that camp."

"I can’t talk her out of choosing for herself, Annie. Not without becoming exactly the kind of person who decided things for her, the way Marley did her whole life." He held her gaze steadily despite her obvious anguish. "I understand wanting to protect her. I do. But she gets to choose this, the same way I got to choose activating the Coordinate on my own terms instead of the Founder’s. Taking that choice away from her, even out of love, isn’t protection. It’s just a different cage."

Annie’s jaw worked, fury and grief and grudging understanding tangling together. "I hate that you’re right."

"I hate it too, honestly. I’d rather it wasn’t true." He put a hand on her shoulder, careful and steady. "But if she does this, she won’t do it alone. None of us will let that happen. That much I can promise you completely."

Ymir’s formal acceptance triggered a mission update that felt, for the first time since the system’s transparency reform, genuinely heavy rather than simply informative.

[Mission "The Binding" — Candidate confirmed: Ymir Fritz. Consent verified.][Ritual requirements: Aeldrin binding components (in transit, 14 days), full-moon alignment (next viable window: 31 days), minimum three willing anchors to stabilize the ritual’s energy transfer.][Anchor role: High physical and emotional risk. Anchors must maintain unbroken physical contact with candidate throughout ritual duration.]

"I’m an anchor," Eren said immediately.

"So am I," Mikasa said, no hesitation at all.

"And me," Annie added, voice tight but resolved. "If my sister’s doing this, I’m not standing outside the circle wondering if she survives it."

[Three anchors confirmed: Eren Yeager, Mikasa Ackerman, Annie Leonhart. Ritual stability projection: 78%. Improved from baseline 52% with unbonded anchors.]

"Why does having us specifically improve the odds?" Mikasa asked.

[Anchors with existing emotional bond to candidate provide stronger stabilization. This is not sentiment — it is measured, consistent effect across all recorded historical bindings.]

Armin, scribbling furiously in his notebook, looked up with something between fascination and grim satisfaction. "So love is literally a game mechanic now. I have so many things to say about that, and no time to say any of them properly."

That night, with thirty-one days until the ritual and ninety-something until the ship’s estimated arrival, Eren found Mikasa in their quarters, quietly checking her gear with the meticulous care she always brought to preparation for something that actually mattered.

"You didn’t argue when I volunteered as anchor," he said, settling beside her.

"I already knew you would. Arguing would have wasted both our time." She set down the blade she’d been sharpening, meeting his eyes. "I’m terrified, Eren. Of the ritual, of Ymir’s odds, of what it means to stand that close to something ancient and anchorless while it’s being forced into a cage." Her voice steadied despite the admission. "But I’d rather be terrified standing beside the people I love than safe somewhere else, wondering."

He pulled her close, the weight of the coming month settling heavy but shared between them, exactly the way he’d promised it always would be from now on.

"Thirty-one days," he murmured.

"Thirty-one days," she agreed. "We prepare. We train. We make sure Ymir walks into that circle as strong and as protected as three people who love her fiercely enough can possibly make her."

[Active Mission: "The Binding" — 31 days to ritual window. Preparation phase: 12% complete. Recommend prioritizing anchor synchronization training.]

Outside, the autumn wind carried the first true cold of the season across a district that had rebuilt itself twice now, unaware that its fiercest fight yet was being planned in quiet rooms by people who’d finally learned, the hardest way possible, to face impossible choices together instead of alone.

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