Kunoichi Tsubaki no Mune no Uchi

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 beings of danger, to exchange 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.