Futsuu no Ko

Satoshi Kusakabe, who is incredibly beautiful but has a super plain personality, is a pitiful boy who's always dismissed as being boring. One day, Kei witnesses his classmate Shindo being intimate with another man. The exhilaration of knowing a classmate's secret which has nothing to do with love, and Shindo's smile when he offhandedly says Kei's normal, plain self is funny, begins to dominate Kei with a mysterious feeling of excitement... A story about a handsome high school student's troubled love. (Source: Houbunsha, translated)