When the dead rise and chaos descends upon Japan, Takashi Kimuro faces the unthinkable task of putting down his infected best friend. Teaming up with Rei Miyamoto, the girl left behind by his lethal deed, they navigate a world plunged into darkness. With society in ruins, they embark on a perilous quest alongside Saeko Busujima, the graceful leader of the Kendo Club; Kouta Hirano, a gun-loving otaku; Saya Takagi, daughter of a prominent figure; and Shizuka Marikawa, the attractive school nurse. Together, they seek out loved ones and search for answers behind the deadly outbreak. But in a world overrun by the undead, will their unity be enough to survive the apocalypse?