Cheeky Angel (2002)

Cheeky Angel is a comedy romance action manga series by Hiroyuki Nishimori. The story revolves around the adventures of 15-year-old schoolgirl Megumi Amatsuka, a popular and beautiful tomboy that always get into fights with a secret: she used to be a boy. Originally a serial in Shōnen Sunday, it has been collected in 20 tankōbon volumes and adapted as a 50-episode anime series. In 2001, the manga won the Shogakukan Manga Award for shōnen.