Cerberus

Kei is often drawn into fights, even though he is weak and usually loses. One day, while helping a friend carry textbooks to an old school building, Kei and his childhood friend Tomoe are attacked by a monster. To save Tomoe, Kei chooses to become a Grave Protector. The story draws on the idea of Cerberus, the hound of Greek mythology that guards the Underworld’s gates and prevents the dead who cross the river Styx from escaping.