Stop!! Hibari-kun! is a Japanese manga series written and illustrated by Hisashi Eguchi. It was serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump from October 1981 to November 1983, and the chapters were published in four tankōbon volumes. The series was adapted into a 35-episode anime television series by Toei Animation that aired on Fuji Television from May 1983 to January 1984. The story focuses on Kōsaku Sakamoto, a high school student who goes to live with yakuza boss Ibari Ōzora and his four children—Tsugumi, Tsubame, Hibari and Suzume—after the death of his mother. Kōsaku is shocked to learn that Hibari, who looks and behaves as a girl, was assigned male at birth.