After father's death and the inheritance conflict that started there, only the debt is left. It was the student's body Narumiya Kyouko that was stuck with that unreasonable reality... In this situation, the happy life with younger brother, the future will be lost.

Pretty girl Tsukishita Kaori that has approached such Narumiya brother and sister. When Kaori tempts Shirou of the younger brother and makes him a pet, elder sister Kyouko proposes to become the work partner.

What is the work, the body of young and beautiful was made a selling point. "Tsukishita Kaori" called management ―― of darkness site...

For the repayment of a huge debt, lewd communal life was started.