Ichiro Fujiki

Cheeky Angel (天使な小生意気, Tenshi na Konamaiki?) is a comedy romance manga series by Hiroyuki Nishimori. It focuses on the adventures of a 15-year old schoolgirl Megumi Amatsuka, a popular and beautiful tomboy with a secret: she remembers being a boy whom a genie/trickster had changed into a girl. Only in the last volume is the trickster's trick fully revealed. Originally a serial in Shōnen Sunday, it has been collected in 20 tankobon volumes and adapted as a 50-episode anime series. In 2001, the manga won the Shogakukan Manga Award for shōnen.

Source: Wikipedia