The protagonist Kazuya has an accident, after which he falls into a coma. Waking up after 5 years, he finds himself in a capsule of cryogenic sleep in an underground shelter-bunker. Soon he manages to communicate with his friend Yuma wirelessly. Yuma tells Kazue that while he was asleep, war broke out with the monsters in the world whom M.O.W. called for during his experiments. . and he himself has served in the army for some time. Yuma offers Kazuya to get out of the bunker, go through the city and get to him to explain everything and understand what to do next. In the bunker, Kazuya is the only survivor and monsters are walking around, so you have to break through the battle. Armed with a nearby pistol and loaded with ammunition, Kazuya sets off on a journey in which he will find many unexpected discoveries about himself, about his friends and enemies, and maybe he will become the one who decides the fate of the world.