Kasumi Kogen, the Village of Mist, is located in a beautiful rural region somewhere in Japan, featuring a Shinobi Gakuen training school for female ninja (kunoichi). The school gathers competent students from all over Japan to rigorously train them in the ninja arts.Hinata Himawari has always wanted to be a great ninja, and find a master to serve. Her entrance into the school turns out to be rather unusual, when her ninja-kite crashes into the village's torii. The just arrived and newly assigned teacher Marikoji Hayato forced to take on this demanding teaching job due to debt rushes to save Himawari, his to-be student.Himawari notices the ninja mark on Hayato's neck, and forthwith believes to have finally found her master. Is this fate? Curiously, Himawari's fellow female ninja classmates Azami, Shikimi, Himeji, and Yusura watch the entertaining spectacle.Will Himawari be able to become a fully-fledged ninja, and protect her master from the all too playful attacks by students and ninja teachers?