Bone Collection, Volume 1: I Don't Want to Die! (Bone Collection #1-7)

Kazami Jinai is hopeless exorcist who isn't good at anything with one exception: he can use a forbidden spell that gives him access to a yokai's power! One fateful day, Kazami meets the beautiful Paira, one of the most powerful yokai around! But she doesn't plan on wreaking havoc on humans... She wants to become one herself!