Classmates, also known as Doukyusei , 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, Sotsu Gyo Sei – Spring, Sora and Hara, O.B., Blanc, Home, and Sajō Rihito no Chichi to Sono Buka. An anime film adaption of the first volume of the series, Doukyusei: Classmates, was produced by A-1 Pictures and released in February 2016.