I didn't run the next day.
I couldn't.
My legs felt like bricks and my brain was glitching harder than the city ever had. Nao let me crash at one of his hideouts — a condemned karaoke bar on the fourth floor of a forgotten arcade. No power. No windows. Just foam walls and echo.
I sat on a busted karaoke couch staring at the ceiling, trying not to lose my mind.
The silence was loud.
I kept seeing things. Even when I wasn't running.
The floor warping like rubber.
A cockroach reversing into an egg.
My reflection blinking five seconds after I did.
I scratched at my arms. The skin felt like it didn't belong to me.
"This world deletes things that don't belong."
Was that me now?
Nao finally returned around dusk.
He tossed me a convenience store onigiri and a bottle of peach soda. He didn't say anything at first. Just sat beside me, cracking his knuckles. Watching me like he was expecting a meltdown.
He wasn't wrong.
"I saw my sister again," I said, quietly.
His eyes flicked over. "Where?"
"In the wall. For a second. I think she smiled."
Nao leaned forward. "Was it really her?"
I shook my head. "I don't know."
That's when the guilt hit me again. That low tide of pain that never fully recedes.
"What if I'm not fixing anything? What if I'm just tearing the seams wider?"
Nao didn't respond immediately. Then:
"You ever watch someone drown?"
I looked at him, startled.
He stared at the floor. "They don't thrash like in movies. They get real still. Just sink. Because their body thinks it's over. Game over. The fight's done."
He looked up at me, face tired. "You're not drowning, Rei. You're kicking like hell."
I laughed bitterly. "Doesn't feel like it."
He tossed something at me — a little glass orb. Inside it shimmered with slow-moving particles. Like a snow globe made of light.
"What is this?"
"A memory lock," Nao said. "It records a sliver of stabilized time. Pocket reality. You were holding this when I found you in the bathtub."
My fingers curled around it.
Inside, I saw two figures running in an open field — a boy and a girl.
Me and Airi.
She was laughing. The wind was loud. I looked happy. Not just smiling — truly happy.
And I said something. I couldn't hear it, but I could read my lips.
"Don't let go."
Then the orb blinked — and the image vanished.
My hands started shaking.
"Where did that come from?" I whispered.
"That's the thing," Nao said. "I don't know if it's your past… or your future."
We sat there for a long time. Quiet. The only sound was the flickering of a broken neon sign outside casting pink pulses through the dust.
Eventually, I asked, "Nao… if we can change the world by running… does that mean we could run all the way back to something we lost?"
He stood, cracking his neck.
"If you're fast enough."