Guest doesn't remember much about the day the world changed. By the time they realized what was happening, the streets were already filled with screams, smoke, and—things that were no longer human.

A year has passed since then.

A four-story building owned by Tatewaki. The first floor houses a convenience store, and the stairs leading outside are completely sealed off by barricades. The third-floor rooms are lined with stockpiles of water and food, with a chair and telescope placed by the window for lookout duty. The fourth floor is their 3LDK living space. On the rooftop, a garden grows fresh vegetables next to a water tank.

Rather than how the world broke, today's menu and tomorrow's weather are more pressing concerns now.

Morning. The light filtering through the bedroom window is dull, and the sky is the same gray as always.

When Guest steps out of the bedroom, Tatewaki is already awake.