After his mother's death, Kuro Takagi transfers to Yotsuji Private High School where his father is the headmaster. But Yotsuji is no ordinary high school—it doesn’t allow students to remain on campus past 5 o’clock! On his first day of class, Kuro and his classmates inadvertently break this rule and find themselves victims of a zombie attack. Although they manage to narrowly escape, this is but a prelude to more encounters with the undead, especially after Kuro discovers his own blood-ties and latent zombie abilities. From there, it's full steam ahead as this dark and intense action/comedy shifts into high gear.