Tsubaki is a top student in the female ninja "Akane Group". The female ninjas have been attending classes separately from the male ninjas and have never seen a man since they were young. That's because for a long time, the Akane Group has a rule: "No communication with men, because men are dangerous creatures!" The teachers' prohibition has aroused their curiosity about men. During a mission, Tsubaki accidentally saw a figure that looked like a man. Although she knew that she couldn't break the rules, why did she feel so nervous?!