Haruto Tatsumori, a regular high school student, rescues a girl from some thugs on his way home from a part-time job one day. As things unfold, he ends up living together with the blonde beauty he saved, but her true identity remains shrouded in mystery.... more>>

Later, due to a certain incident, Haruto suffers a grave injury and is forced to drink the girl's blood, forming a contract with her.

Now bound as the familiar of this enigmatic girl, Haruto gradually gets swallowed up by the world of the extraordinary— <<less