Dark edge - Yu Aikawa

After his mother's death, Kuro Takagi tranfers to Yotsuji Private high School where his father is the proprietor. But Yotsuji is no ordinary school: it holds a strange rule of 'No students on campus after dark!' On his first day of attendance, Kuro and his classmates inadvertently break the school's highest protocol and find themselves victims of a faculty 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.