In the beginning, the name of this character often appearing in Takehiko's company is never mentioned. He's Henmi's good-humoured and genial friend and university colleague. The first time we see him alone is in the building where Saint Just lives, and in time we'll discover how he's related to Rei...
He likes Mariko Shinobu, and will try very patiently to win her heart, mainly being there for her in a very difficult moment of her life. (from http://members.tripod.com/~aoisora)