The boy had made a contract with a devil so that he can avenge the killer of his parent.

The girl is a new girl at the school who her both parent neglected her since she was a child.

The man is over 100 years old and trying to find his life mate to be with him until the end of the world.

The woman is one hell of devil who were to be assistant to someone for the revenge of his parent.

The boy had no intention to fall in love with anybody, but he began to lust for the female he should not to.

The girl tried very hard to continued her study but a bit losing her focus when a hot teacher is stalking over her and she fell in love with a younger classmate.

The man was a bit distracted and confuse when he found out he has two life mate, an innocent one and a devil one.

The woman can't help feeling jealous when her master fall in love with his friend.

Four of them meet and began to turn the world upside down.

Starring Changmin, Jaejoong, Minhee (OC) and Risa (OC).

Based on Lynsay Sands' Argeneau Anthologies and Anime Black Butler (Kurosuji).