Six high schoolers stuck in a murderous time loop must find the scattered remains of an unknown victim to break the curse and finally see another day.

Set during a period of exceptionally rainy weather, high-school boy Hodaka Morishima runs away from his troubled rural home to Tokyo and befriends an orphan girl who can manipulate the weather.

Over a 4 day period, a fierce battle takes place between Korean independence militias and imperialist Japanese forces in Manchuria, China. The militia includes a master swordsman and an expert marksman.