Aya Takahashi was just your average high school bookworm with a love for isekai and melon bread… until the night she finished reading “When the Sky Cracked and the Towers Fell.” One moment she’s turning the last page, and the next—she wakes up in the body of Rei, the battle-hardened heroine of a futuristic, apocalyptic world full of collapsing skyscrapers, rogue AI, and mecha-monsters.

But here’s the real glitch—Rei wakes up in Aya’s body too.

Now stuck in each other’s lives, Aya has to learn how to fight for humanity’s survival with Rei’s overpowered skills and terrifying enemies, while Rei, armed with nothing but Aya’s glasses and confidence, rampages through modern Japan like a video game NPC in a slice-of-life anime.

As the worlds around them begin to unravel, the two girls must find a way to reverse the swap, uncover the mystery behind their connection, and maybe—just maybe—save both of their realities in the process.