Shinobazu!(2012)

Shinobazu!

Yukihime Serizawa, a pure-hearted and pretty high school girl, is being targeted by boys all over the school. Concerned about her situation, Yukihime's ex-girlfriend dispatches Helen, a blonde-haired kunoichi (female ninja), as her bodyguard, but Helen falls in love with Yukihime and the situation around her becomes increasingly complicated.