Tenshi Na Konamaiki Japan

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.