Endo is a high level demon who ran away from home so he wouldn't have to marry Verde (his childhood friend).

Since he didn't want to go back to his world he decided to live with the person who summoned him, Rikiya Higuchi.

In the demon world, Endo takes on the form of a devilishly handsome demon with long red hair and elf-like ears. He also has a elder brother, whom he rivals with, named Kaim.