Ojisan Ebihara is approached by Nana in the park. He was worried that he was about to die. The two become good friends and spend time at Ebihara's house on their way home from school. Ebihara, who was unemployed, wants to continue such a relationship and borrows money to entertain Nana. Then, one day, a debt collector comes to Ebihara to collect and Na proposes to repay it with her body!