Reborn as Eren Yeager: The Gacha System

Kessler came to the barracks himself this time, no letter, no cryptic note under a pillow — just a man in a plain traveler’s coat standing at the visitor’s gate on an ordinary Tuesday afternoon, asking for Eren Yeager by name like it was the most unremarkable request in the world.

"He’s not on any approved visitor list," the gate guard said, unimpressed.

"Tell him it’s about his father’s old debts," Kessler said. "He’ll understand."

Eren did understand, and against every reasonable instinct, signed himself out for the afternoon and walked with Kessler along the low stone wall bordering the training grounds, Mikasa trailing three steps behind with a hand never far from her blade.

"You look older," Kessler observed, studying him. "Not in years. In whatever it is that makes a person stop flinching at things that used to startle them."

"A lot’s happened."

"I’d imagine. Transformation tends to age a person quickly." Kessler said it plainly, no shock in his voice at all, and Eren realized with a start that of course he already knew — the man’s information network apparently ran faster and deeper than Eren had fully appreciated. "I came because the timeline’s moved. Faster than even I expected, and I’ve been tracking this particular thread for six years."

"How much faster?"

"Weeks, not months." Kessler stopped walking, turning to face him fully. "I won’t lie to you, Yeager. I don’t know the exact day. Nobody outside the innermost circle does, by design. But I know enough patterns from watching this kind of operation twice before to recognize the shape of an imminent one. Supply movements. Personnel reassignments. The kind of quiet administrative noise that precedes something loud."

Mikasa’s hand tightened on her blade hilt. "You said you’d watched this happen twice before. What happened the other times?"

Kessler’s jaw worked, old grief flickering behind careful eyes. "The first time, the boy died before anyone understood what he was. The second time, we understood in time, and he survived — but the district he was protecting didn’t. I’ve spent years trying to find a version of this where both survive." He looked at Eren, something heavier than warning in his expression now. "I don’t know if this is that version. I know I intend to try."

He gave them what details he could — a rough timeline measured in weeks rather than the months everyone had assumed, a description of the kind of coordinated assault likely to come rather than another isolated breach, and a warning that struck colder than anything preceding it.

"They know about the transformation," Kessler said. "Confirmed, now, not suspected. Which means the people directing this operation have shifted their objective. It’s no longer simply reconnaissance and preparation. It’s retrieval, or elimination, whichever proves easier once the moment actually arrives."

"Retrieval meaning what, exactly?" Eren asked, though some cold part of him already suspected the answer.

"Meaning they’d rather take you alive, if the power can be extracted or controlled that way. Meaning if that proves impossible, they’ll settle for making certain nobody else gets to use what you carry either." Kessler’s voice carried no comfort in the delivery, only plain, necessary honesty. "I’d rather you hear that clearly from me than discover it unprepared in the middle of an actual fight."

Mikasa’s expression had gone hard and flat, the particular stillness Eren recognized now as her preparing for violence rather than processing fear.

"Then we prepare for both possibilities," she said. "Retrieval and elimination. We don’t wait to find out which arrives first."

"That’s precisely the correct response," Kessler said, something almost like approval in his tired eyes. "Your Ackerman inheritance shows plainly, when it matters. I’d trust her instincts over most Garrison officers twice her age, if I were in your position, Yeager."

"I already do," Eren said simply, and Mikasa’s hand found his without either of them needing to say anything further about it.

Kessler left them with one final piece of information before departing, delivered with the particular weight of a man choosing carefully what to reveal and what to withhold even now.

"There’s a name you should know," he said. "Zeke. If you ever encounter someone using it, treat every word from him with extreme caution, whatever kindness he offers alongside it. He’s dangerous in ways that don’t announce themselves plainly, and he has reasons to take a particular interest in you that go beyond ordinary strategic value."

"What reasons?"

"Not mine to explain. Not yet. Ask your father, if the timing ever allows it — I suspect he knows considerably more about that particular connection than he’s told you so far." Kessler’s expression carried something almost like pity. "Your father’s been protecting you from more than just the shape of the coming attack, Yeager. Some of what he’s withheld involves people, not just information. I’d press him on it, if I were you, before circumstances force the revelation without warning."

He walked off toward the gate without further explanation, another cryptic thread left dangling in an already tangled web, and Eren stood there with Mikasa in the fading afternoon light, feeling the weight of yet another unresolved mystery settle heavy alongside everything else.

He wrote to his father that evening, more direct than any letter he’d sent before — Who is Zeke? Kessler says you know. I need the truth, all of it, before whatever’s coming arrives and answers the question in a way none of us are prepared for.

The response came four days later, shorter than Eren expected, and heavier for its brevity.

Zeke is your half-brother. The one I told you about, the one I feared losing news of forever. I don’t know how Kessler’s network connected the two of you, or what involvement Zeke currently has in whatever’s approaching Shiganshina. I only know that if he’s part of this, it means Marley found him again, or he found them, and either possibility terrifies me more than I know how to properly explain in a letter. Please, Eren — if you encounter him, be careful. Not because I believe he’s your enemy. Because I don’t know anymore what he’s become, and I’m not willing to lose either of my sons to a war neither of you chose to inherit.

Eren read the letter with Mikasa and Armin both close beside him, the revelation settling into the increasingly complicated tapestry of family, war, and inheritance that had come to define nearly every corner of his second life.

"Your brother," Armin said slowly, "might be one of the people coming for you."

"Might be," Eren agreed, exhaustion and dread tangling together in his chest. "Or might be someone caught in the same trap as Reiner and Bertholt and Annie — following orders he didn’t choose, carrying weight he never asked for." He rubbed at his temple, the accumulation of the day’s revelations pressing heavy. "I don’t know which version of him I’ll actually meet, if I meet him at all. I just know I need to be ready for either."

Mikasa’s hand found his, steady despite the mounting complexity of everything still unfolding around them. "Then we prepare for both," she said, echoing her own words from earlier that same day. "The same way we’ve prepared for every other uncertain thing this year has demanded. Whatever Zeke turns out to be, whatever the coming weeks actually bring — we face it together, exactly like this."

Fifty-four days, give or take, according to Kessler’s revised timeline.

Whatever those days held — a half-brother’s uncertain loyalty, an accelerating attack, three conflicted Marleyan soldiers still weighing where their true allegiance ultimately lay — Eren understood now, with a clarity both heavier and more focused than before, that the fight ahead would demand every single piece of trust and preparation he’d built this year to survive it.

And for the first time since Kessler’s warning first arrived at the mill so many months ago, he found himself grateful, rather than resentful, for every single hard truth that had finally, fully surfaced in time to matter.

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