ClassmatesClassmates.

Classmates, also known as Doukyusei (Japanese: 同級生, Hepburn: Dōkyūsei), is a Japanese manga series written and illustrated by Asumiko Nakamura. The series follows the relationship between students Rihito Sajō and Hikaru Kusakabe, who meet while attending an all-boys high school. First published in the manga magazine Opera in July 2006, Classmates has spawned multiple sequels and spinoffs: Sotsu Gyo Sei, Winter (Graduate, Winter), Sotsu Gyo Sei, Spring (Graduate, Spring), Sora and Hara, O.B., Blanc, Home, and Sajō Rihito no Chichi to Sono Buka.