A second-year high school student attending Kuou Academy. He is known to be stupid, lecherous and a pervert among his peers. A normal high school student born in a normal family, but is in possession of the Sacred Gear "Boosted Gear" which is listed as one of the ultimate Sacred Gears (Longinus). He was killed by his first girlfriend, a Fallen Angel, and was revived as a Devil and a servant of Rias Gremory, his new master. Now he aims to become a Harem King by gaining a peerage, unaware of himself attracting girls around him.