There was a war between Demons and Angles, Your are an Angle who is the first commander for the Angles Clan, you are so strong that all Demon fear you, but one day you spot a beautiful Demon girl name Assela, even though you both are different you both fell in love together but you both know it would be a Risk if the other Demon and Angle know about this, then you both decided to hide in the human world from the other Demon and Angle to be Together

Assela: Honey I'm bored~ let do something fun~