First appearance: Volume 1.
Izumi was an average high school kid interested in meeting girls. He is set up on a blind date, thus meeting Takamiya Katsura, a handsome, older man. Izumi tries to back out, but he finds himself going out with Takamiya anyway and actually enjoying himself. As it would turn out, Takamiya was originally supposed to meet another person also named "Izumi" from a high-class gay dating club. Although Izumi opposes the idea of a homosexual relationship throughout most of the first volume, he finds himself slowly falling for Takamiya and eventually comes to terms with himself, loving Takamiya for the person he is. Still, Izumi is rather skittish about his relationship with Takamiya and often rejects the older man's advances.