In the Heart of Kunoichi Tsubaki
The isolationist Akane Clan, composed of an all-girls body mainly consisting of young kunoichi in training, has a code to which they all must adhere:
As men are dangerous beings, interacting with them is forbidden.
Kunoichi Tsubaki, the leader of the Dog Squad, is an excellent trainee with a promising future, but she has started to experience a strange feeling in her heart... whenever the subject of boys is brought up. (m-u)