Nana Kisaki approaches Ebihara, an older man, in a park, and he becomes concerned by her behavior. They grow closer, and eventually, Nana starts staying over at Ebihara's place after school. Unemployed, Ebihara takes out loans to keep indulging Nana's desires, hoping to maintain their relationship. But one day, loan collectors arrive and suggest Nana repay the debt with her body. Curiosity builds over how their relationship will evolve from this point forward.