Reborn as Eren Yeager: The Gacha System

The stranger arrived on a gray morning, and Shiganshina noticed him the way it noticed anything unfamiliar — slowly, then all at once.

He wasn’t Garrison. Wasn’t a merchant, either, despite the well-made coat, and he carried himself with a stillness that made Eren’s skin prickle the second he spotted him across the market square, standing near the well like he had nowhere in particular to be and every reason to watch everyone who passed.

"Who’s that," Armin asked, following Eren’s gaze.

"I don’t know."

"You’re staring like you do know."

Eren didn’t answer right away. Something about the man’s posture — economical, coiled, the specific stillness of someone who’d been trained rather than simply grown up careful — sat wrong in a way he couldn’t immediately name. Then it landed, cold and sudden.

I know this. Not him. But this. The shape of someone who wasn’t from inside the walls at all.

"Eren?" Mikasa’s voice, closer now, quiet.

"Nothing. Just — tired."

She didn’t believe him. She rarely did anymore, though she’d stopped pushing every single time, choosing instead to file it away with everything else. This time, though, her eyes stayed on the stranger a beat longer than casual interest required, and Eren realized, with a fresh chill, that she’d noticed the wrongness too, even without knowing why.

The flicker hit that evening, sharp enough that Eren nearly dropped the water jug he was carrying.

Not the vague, seconds-long stutter he’d gotten used to. This one came with an edge of something almost like sound — a name, or the shape of one, gone before he could hold onto it. A flash of the warehouse door. Someone standing in it who shouldn’t be.

He was moving before he’d finished deciding to.

"Eren—" Carla, startled, watched him bolt from the kitchen without explanation, jug abandoned on the table.

He reached the warehouse just as the door — which he always, always kept latched — swung open under someone else’s hand.

The stranger from the market square stood in the doorway, one hand still on the frame, and went very still when he saw Eren standing there, breath ragged from running, in front of a warehouse stocked with far more supplies than any ordinary household would ever need.

For a long moment, neither of them moved.

"That’s an impressive stockpile," the man said finally, voice even, unreadable. "For a family of three."

"It’s for emergencies." Eren’s heart hammered, the reflex enhancements humming under his skin without doing a single thing to help him figure out what to actually say. "We had a bad winter a few years back. My father likes to be careful."

"Mm." The man’s eyes moved over the shelves — the maps, tucked half-visible in an open drawer Eren hadn’t latched properly, the food organized with a precision no child should have bothered with. "Careful is one word for it."

"Who are you?"

"Someone who’s been watching Shiganshina longer than you’d guess." The man’s gaze came back to Eren, sharp and assessing in a way that made every instinct the system had ever handed him scream at once. "And someone who’s noticed things about this district lately that don’t quite add up. A shelf collapsing that shouldn’t have. A boy who reacts faster than any child his age has business reacting. Supplies stacked like someone’s expecting the worst kind of trouble."

Eren said nothing. Saying nothing felt like the only safe option available.

"I’m not here to cause you harm," the man said, reading the silence correctly. "But I’d be careful, if I were you, about how visible you make yourself. Not everyone who notices things does so with good intentions."

"Is that a threat?"

"It’s a warning. There’s a difference, if you’re smart enough to hear it." The man stepped back from the doorway, hands loose and open, nothing about his posture suggesting violence — only a controlled, watchful patience that unsettled Eren more than aggression would have. "Whatever you’re preparing for, boy, you’re not as unnoticed as you think you are. That should worry you."

He turned to leave.

"Wait—"

The man paused.

"What’s your name?"

A long silence. Then, almost like an afterthought: "Doesn’t matter yet. Maybe it will, someday." And he was gone, into the gathering dark, footsteps too quiet for someone his size, moving like he’d trained for exactly this kind of unnoticed exit.

Eren stood in the empty doorway a long time, pulse still hammering, the flicker’s warning finally making horrible sense.

Someone’s watching. I’m not as hidden as I thought.

He found Mikasa on the roof that night, because of course he did — she’d taken to waiting there on the nights he came back from the warehouse looking like something had shaken him, without ever asking directly what.

"You’re pale," she said, by way of greeting.

"Someone was at the warehouse."

That got her full attention immediately, posture going sharp and alert in a way that reminded him, uncomfortably, of the boar. "Who?"

"I don’t know. A stranger. Not from around here." He sat down heavily beside her, the cold of the tiles doing nothing to steady the churn in his stomach. "He’d noticed the supplies. Noticed — things about me. Reflexes. He said I wasn’t as unnoticed as I thought."

Mikasa was quiet a moment, processing this with the same careful thoroughness she gave everything, and when she spoke again her voice had gone low and steady in the way it did when something actually frightened her and she refused to let it show as anything but calm.

"What kind of things does he think he’s noticed?"

"I don’t know exactly. Enough." Eren dragged a hand through his hair, exhaustion and fear tangled together until he couldn’t separate them. "Mikasa, I need you to trust me on something."

"I already do."

"I mean — really trust me. Because I can’t tell you everything yet. Not all of it. But someone out there is starting to watch this house, watch me, and I don’t know yet if that’s dangerous or just curious, and until I know, I need you to be careful. More careful than usual."

She turned to look at him fully, dark eyes steady in the moonlight, and reached over to take his hand without hesitation — not the shy, uncertain touch from the market road weeks ago, but something firmer, more deliberate.

"I’m not going anywhere," she said. "Whatever this is. Whoever that man is. You don’t have to explain it all tonight. But you don’t get to face it alone, either. That’s not how this works anymore."

"Since when?"

"Since the boar, probably. Maybe before that." A small, almost rueful smile. "You don’t get to decide alone that protecting me means keeping me in the dark, Eren. If something’s coming, I want to be standing next to you when it arrives. Not hidden away somewhere safe, wondering."

Something in his chest cracked open, warm and aching all at once. "You make it very hard to keep anyone at a safe distance, you know that?"

"Good. I wasn’t trying to make it easy."

He laughed, short and surprised, some of the day’s tension finally loosening in his shoulders. "When did you get so terrifying?"

"I’ve always been terrifying. You’ve just started noticing."

Their hands stayed linked, warm despite the cool night air, and for a while neither of them said anything else — just sat together on the roof, watching the lights of Shiganshina flicker below, the wristband on his wrist catching moonlight, the compass heavy and steady in his pocket.

"I’m scared," Eren admitted quietly, the words coming easier in the dark than they ever did in daylight. "Not of the man. Of running out of time before I’ve done enough."

"Then we’ll make sure you have enough." Her grip on his hand tightened, sure and unwavering. "I’m not planning on going anywhere either, remember? Whatever enough looks like, you’re not building it by yourself."

He looked at her — really looked, moonlight catching the fierce, steady certainty in her eyes — and thought, not for the first time, that whatever the system gave him, whatever fragments of Titan biology or reflex enhancements stacked quietly in the background, none of it came close to mattering as much as the girl sitting beside him, refusing point-blank to let him carry any of this alone.

"Someday," he said softly, "I’m going to tell you everything. All of it. And I need you to still be sitting here when I do."

"I will be." No hesitation at all. "I already told you. I’m not going anywhere."

Below them, the warehouse sat dark and quiet, its secrets a little less safe than they’d been that morning — and somewhere beyond Shiganshina’s borders, a stranger who knew too much walked back into whatever shadow he’d come from, carrying questions Eren wasn’t ready to answer.

One hundred and forty-five days.

The countdown had stopped being an abstract number in his head. It had teeth now. And for the first time, it felt like something else was watching the clock too.

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