Having never done anything bad and lived a dilligent life, Shushu is suddenly framed for murder and imprisoned in a prison for women. In order to survive amongst harsh and vicious criminals, "W-Will you be my prison wife?" she becomes the wife of her very pretty but very scary roommate, who is also the prettiest(?) girl in the prison, Minicat. But something is weird. Why is she suddenly having the kind of feelings she would have for a man for this beautiful Minicat instead? "It's a rule, cabbage. Close your eyes when we kiss and I'll treat you nicely."