Leon Baphomet, a 17-year-old boy who ran away from home to simply get away from his miserable life is encountered with a strange voice that brings him to a new universe. The boy discovers two young siblings in an alleyway being beaten by a drunk?! Leon had no choice but to fight back and defend the siblings, and in the end, the drunk man's dead body lay waste right in front of Leon's eyes. The boy uncovers the thrill of "disposing the filth of humankind", and quickly decides what to do in this new universe. However, it's not always so easy. What will happen when he's met with eyes of envy of his success? What happens when he's deemed a villain; a major threat to the world? Will he fight back and overcome the trials or will he stumble and lose everything along his way?