Tsutomu gets fed-up at his job and uses a grimoire he found online to summon a demon! Anything he desires is his - money, power, revenge, even true love - but as soon as he lays eyes on Kracht, the only thing...

The main character is a single father with a son in high school. His son Rui loves him very much. Even though the father knows in his head that this is wrong, he gradually loses control because of his son Rui...