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The outside of door

扉の外

Ryuuki Chibano and his entire high school class wake up trapped inside a large room. An AI named Sophia appears on a monitor, informing them that they are aboard a spaceship and are the only human survivors after a nuclear apocalypse on Earth. Sophia declares that she will provide for all their needs as long as they wear a metal bracelet, which symbolizes their citizenship in the new "nation" formed within the room.

Anyone who removes their bracelet surrenders their rights to full support and may exit through the only door, but they will never be allowed back inside and will have no access to food, water, or help. Ryuuki, who has always struggled with authority, immediately takes off his bracelet and steps outside, becoming an outsider and observer of his former classmates. As days turn into months, tensions between Ryuuki and the rest of the class escalate, and the group must confront the harsh realities of their confinement and the choices they have made.

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