Oji Mr./Ms. Ebihara is accosted by Nana in the park. I was worried about the appearance that I was about to die. The two become good friends and spend time at Ebihara's house after school. Ebihara, who was unemployed, borrowed money to continue such a relationship and entertained Nana. - One day, a debt collector comes to Ebihara to collect and Nana proposes to repay it with her body!