He is a classmate of Shiratori who is always trying to charm high school girls and young women (but has no interest in Middle school or younger "flat" girls). He happened to meet Shiratori when he was dressed as a girl due to a prank and fell in love with "her". Without a name to call this newfound love, he nicknamed her "Reiko", not realizing that she was really Shiratori.

Shiratori Ryuushi is a young artist-in-training, about to start studying at a vocational school. Arriving at his new lodgings, Narutakisou, he finds himself the focus of attention for the collection of weirdos that inhabit the place. He also meets and falls for the landlady, Aoba Kozue, who seems to be both lovely and charming. However, Kozue is not what she seems to be... in fact, she's more.
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(Source: Anime News Network)

Tsubasa Yamabuki