Takashiro Akira is an ordinary high school boy and basketball player. He has a playful rivalry with his best friend Kudou Eiji, who both want to win the heart of their third friend, Miku. He has a chance to a promising future -- but then an earthquake tears through the school.
When Akira wakes up, he finds to his horror that Eiji has been killed -- but not from the earthquake. Horrible and grotesque monsters have infested the school and eaten up all the students! He finds among the corpses student council president Shirasaki Nao and the bully Tadokoro -- and then Akira receives a text that Miku is in the ravaged city as well… Will they survive in their nightmarish new world?