Reborn as Eren Yeager: The Gacha System

Erwin took the news the way he took most impossible things — with a long silence, a single sharp question, and then immediate, practical motion.

"Four months," he repeated, studying the rough coordinates Historia had sketched from memory. "That’s enough time to prepare, not enough to grow complacent about it. I want a full readiness assessment by week’s end. And Yeager—" his eyes found Eren across the war table "—I want you training with every shifter we currently trust, not just drilling alone in a field somewhere. If this arrives as an uncontrolled Titan-scale threat, you won’t beat it through raw power. You’ll beat it through coordination, the same way Trost was survived by people working together instead of one person carrying everything alone."

"Understood, sir."

"Good. Because I intend to hold you to that, personally, if I see you drifting back toward old habits."

The training that followed looked nothing like the desperate, solitary pushing Eren had done before the cliffs. Reiner ran him through coordinated shifter drills, the two of them learning to fight alongside each other instead of merely near each other, old wariness slowly reshaping into something closer to genuine partnership. Annie, still careful, still guarded, offered brutal, efficient correction to his close-combat form that made him faster in ways two years of reflex draws never quite had.

"You still telegraph your transformation," she said flatly, watching him shift and dismiss the form for the fifth time that afternoon. "A half-second warning, every time. Against something with real speed, that’s the difference between winning and dying."

"Then teach me to hide it."

"I can’t teach what I don’t fully understand myself. But I can watch you fail at it enough times that you eventually stop failing." A ghost of dry humor crossed her face. "Consider it payback for nearly killing you at Trost. I owe you several dozen bruises, by my count."

Ymir, now old enough to join supervised drills of her own, watched from the sidelines with fierce, focused attention, taking notes the way Armin once had — cataloguing, learning, building toward whatever version of strength she intended to become.

"You don’t have to fight in this," Eren told her during a break, wiping sweat from his brow. "Whatever’s coming, you’ve already given enough to this war."

"I decide what I’ve given enough of," Ymir said, steady despite her age. "I watched people risk their lives crossing an ocean to get me out of a camp. I’m not going to sit safely behind a wall while the same people risk everything again without me learning to actually help."

He didn’t argue further. He recognized the particular stubborn resolve too well to waste breath fighting it.

Mikasa trained separately most days — hand-to-hand against Garrison instructors, gear work against increasingly difficult obstacle courses Hannes designed with visible relish — but she and Eren met every evening without fail, comparing notes, planning together the way they’d promised.

"Historia wants to teach me something," she said one evening, toweling sweat from her neck as they walked the perimeter wall together. "Some technique her grandmother apparently passed down. She says it might help identify weaknesses in an unbound Titan form faster than trial and error would."

"Do you trust her enough to learn it?"

"I trust that we need every advantage we can get, whether or not I fully trust the source." Mikasa glanced at him. "That’s the whole point of what we agreed to, isn’t it? Not waiting for perfect trust before we act. Just being honest about the uncertainty and moving forward anyway."

"Fair point." He bumped her shoulder lightly. "I think that’s actually good advice, and I say that as someone who spent two years learning it the hard way."

She laughed, the sound easing something in his chest that months of preparation and old fear had kept wound tight. "I learned from a good teacher."

"Now you’re just flattering me."

"A little." She caught his hand, lacing their fingers together as they walked. "Mostly I mean it."

The weeks accumulated into a month, then two, the garrison’s readiness sharpening with each passing drill, and Eren found himself, for the first time in this entire impossible war, actually sleeping through most nights instead of lying awake counting down toward some invisible deadline.

"You’re different," Grisha observed one evening, visiting from his own quiet work with Zeke to check on his son’s progress. "Calmer, somehow, given everything still bearing down on us."

"I think I finally understand something Mikasa’s been telling me for two years." Eren watched his father settle onto the bench beside him, older now, more at peace than Eren had seen him in longer than he could remember. "Preparation doesn’t have to come from fear. It can come from just — wanting to protect something, deliberately, without the fear driving every decision."

Grisha studied him for a long moment, something like quiet pride settling into his tired, weathered face. "Your mother would be proud, watching who you’ve become. I know I am."

"She’s not here to see it?"

"She’s visiting Ymir’s old records with Hannes, trying to trace what happened to any other survivors from that camp." Grisha’s voice carried gentle affection. "She’s become quite formidable herself, this past year, in her own quiet way. I suspect she’d tell you the same thing I’m telling you now, if she were sitting here instead of me."

Eren smiled, something warm settling in his chest at the image — his mother, once simply a baker’s wife worried for her son’s safety, now actively working to trace and help the survivors of a war she’d once only feared from a careful distance.

"We’ve all changed," he said quietly. "All of us. I don’t think any of us are the people we were when this started."

"No," Grisha agreed. "I think that’s rather the point of surviving something this large, together. You don’t come out the other side unchanged. You come out the other side finally understanding what you were always capable of becoming."

That night, on their rooftop, Eren relayed the conversation to Mikasa, watching her expression soften at the mention of Carla’s quiet, determined work.

"Two months left," she said, tracing idle patterns against his palm. "We’re actually ready this time. Properly ready, not just desperately scrambling."

"We are." He pulled her close, watching the last light fade gold over a Shiganshina that no longer felt fragile, but hard-won and resilient, built by people who’d chosen, again and again, to fight for it together. "Whatever comes on that ship, whatever Historia’s vision actually meant — I think we finally have the tools to face it properly. Not alone. Not desperate. Together, the way we should have been facing everything from the very beginning."

She kissed him, slow and certain beneath a sky gone violet with evening, two months of careful, deliberate preparation settling into something steadier than fear had ever managed to provide.

"Together," she agreed, and beneath the darkening sky, two people who’d rebuilt an entire war strategy around partnership instead of solitary sacrifice held onto each other, steady and unafraid, watching the horizon for whatever still approached.

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