A married woman, Nao, who heard a rumor that thieves who steal only bicycle saddles are frequent in the neighborhood.When I told her husband about it, Nao also had many opportunities to ride a bicycle, so she was told to be careful.Nao is optimistic that she has nothing to do with her, but in fact, she is being watched by a saddle man...One day, when she was about to go shopping, she found that the saddle of her bicycle had been stolen.A man with a saddle in one hand talks to her, saying that she has returned to the upset Nao when she sees it.