Reborn as Eren Yeager: The Gacha System

It happened without warning, three weeks after the airship assault — a low, resonant crack echoing through the storage bunker where Annie’s crystallized form had remained motionless since the day of her attack.

"It’s changing," the guard on duty reported, voice tight with alarm. "Get Yeager. Now."

Eren arrived within minutes, Mikasa close behind, to find hairline fractures spreading slowly across the crystal’s surface, faint light pulsing from within like something long dormant finally stirring back to life.

"Is she waking up?" Armin asked, notebook forgotten in his hand as he stared at the phenomenon with equal parts fascination and dread.

"I don’t know." Eren approached carefully, close enough to see the barely visible shape of Annie’s face beneath the fractured surface, eyes moving beneath closed lids. "Annie? Can you hear me?"

The crystal pulsed brighter in response, fractures spreading further, and for a long, suspended moment, the entire bunker held its breath.

Then, as quickly as it had begun, the light faded, the fractures stilling without fully breaking through.

"She’s not ready," Armin said slowly, disappointment and relief tangling together. "Whatever triggered this — maybe her body sensed something, maybe it’s simply time-based — she’s not fully emerging yet. But she’s not fully dormant either."

Eren stared at the crystal, at the fragile, flickering evidence of a girl still fighting her way back from whatever prison she’d chosen for herself, and felt fresh resolve settle into his chest.

"Then we wait," he said. "And we make sure that whenever she does wake up fully, her sister’s the first thing she sees."

Ymir, when informed, insisted on staying near the bunker despite Erwin’s initial reluctance, and Eren found himself, over the following days, watching an odd, tender routine develop — the young girl sitting for hours beside her sister’s crystallized form, talking quietly about nothing in particular, filling the silence with the accumulated words of years spent unable to speak freely to anyone at all.

"Do you think she can actually hear me?" Ymir asked one evening, catching Eren observing from the bunker’s entrance.

"I don’t know. But I don’t think it hurts to talk to her anyway." He settled down nearby, giving her space while offering quiet company. "Sometimes the people we love need to hear things long before they’re able to properly respond. I learned that the hard way, this past year."

Ymir studied him for a long moment, something thoughtful behind her young, too-weary eyes. "Reiner told me a little about what you carry. The system. The countdown that used to run in your head." She looked back toward her sister’s crystal form. "Do you think that’s why you understood, better than anyone else here, why Annie chose this? Carrying something forced on you by people who didn’t ask permission first?"

"Maybe. Or maybe I just recognize what it looks like, someone trying to protect the people they love with whatever tools they’ve been given, however imperfect those tools turn out to be." Eren’s gaze drifted to the crystal, old empathy and hard-won understanding tangling together. "Annie chose not to kill me, even carrying orders that demanded it. That told me everything I needed to know about who she actually is, underneath whatever Marley forced her to become."

The second crack came a week later, more violent than the first, the entire bunker shuddering as light poured from every fracture across the crystal’s surface.

"She’s emerging!" Armin shouted, already backing the gathered onlookers toward the exit. "Everyone clear the room, just in case—"

The crystal shattered.

Annie collapsed forward, gasping, weeks of dormancy hitting her body all at once, and Ymir was moving before anyone could stop her, catching her sister before she hit the ground, both girls collapsing together in a tangle of tears and desperate, disbelieving relief.

"You’re here," Annie managed, voice raw and broken. "You’re actually here, I thought—"

"I’m here. I’m safe. They saved me, Annie." Ymir held her sister fiercely, tears streaming freely now. "Eren and his friends went into Marley itself. They got me out."

Annie’s eyes found Eren across the bunker, disbelief and something rawer, more vulnerable, flickering behind her exhausted gaze. "Why?" she asked, voice barely above a whisper. "After everything I tried to do to you—"

"Because you chose not to finish it," Eren said simply. "That mattered more than anything Marley forced you to attempt. I decided you deserved the chance to choose differently again, given the opportunity."

Annie stared at him for a long moment, something breaking open behind her carefully guarded eyes, before she finally, silently began to cry — not the careful, controlled tears of someone maintaining composure, but the full, devastating release of years of forced strength finally, fully collapsing.

That evening, once Annie had been examined, fed, and settled into careful, guarded rest beside her sister, Eren found Mikasa on their usual quiet stretch of wall, processing the weight of the day’s revelation.

"She’s actually here," Mikasa said quietly. "Awake. Alive. Reunited with her sister, exactly the way you hoped."

"It doesn’t erase what she did. The people who died in Trost, in the attack she participated in—" Eren’s voice carried old, complicated grief. "But maybe it’s a start. Maybe there’s a version of this where she actually finds a way to make amends, rather than simply being punished or forgiven outright."

Mikasa took his hand, her expression carrying quiet, hard-won wisdom. "That’s not a simple thing to hope for, Eren. Some people won’t forgive her, whatever she chooses going forward. Some grief doesn’t have room for redemption stories, however genuine."

"I know. I’m not asking anyone to forgive her overnight. I’m just asking for the chance that she gets to try." He looked out over the rebuilding garrison, thinking of everything the past year had taught him about second chances, about choosing differently when given the opportunity. "I got a second chance I never earned, Mikasa. I don’t think it’s fair for me to withhold that same possibility from someone who’s finally, genuinely trying to choose better."

She leaned into him, quiet understanding settling into her expression despite the complexity of everything the day had revealed. "You’ve become someone remarkable, this past year. I hope you know that."

"I had good teachers." He pressed a kiss to her temple, gratitude and love tangling together in his exhausted chest. "Whatever comes next — Annie’s uncertain path forward, Zeke’s still-unresolved warnings, the deeper truths about the Founding Titan we still need to uncover — I want to keep facing it exactly like this. Choosing hope, choosing you, even when the war makes both feel impossibly hard some days."

She kissed him then, slow and certain beneath the star-scattered sky, and for a little while, the accumulated weight of the day’s revelations settled into something more bearable — two people who’d chosen, again and again, to believe that even in the middle of devastating war, kindness and love could still find room to grow.

Whatever the coming days demanded — Annie’s fragile new path, the unresolved threat still waiting beyond the walls, the deeper truths about Marley and the Founding Titan still left to uncover — Eren understood, with Mikasa’s hand fierce and certain in his, that he intended to keep choosing exactly this.

Hope, however hard-won. Love, however fiercely tested. And a fight worth fighting, for everyone still willing to choose better, given the chance.

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