Hajime falls in love with his friend's mother, Sumiyo. He knows he can't woo Sumiyo, who is a married woman, in a straightforward way, so he wants to exploit her weakness and play with her body as much as he wants. One day, Hajime finds out that Sumiyo is sexually frustrated. Seeing this as an opportunity, Hajime tries to get her to have a relationship with him. At first, she resists, but she becomes addicted to his erect cock, which she hasn't had in a long time.