Yoshiyuki, who confessed to his best friend, Mitsuo's mother, Sayuri, caressed Sayuri to teach her about a woman's body, and then gave him a handjob. Yoshiyuki runs away from embarrassment. Later, when I went to my best friend's house, even though I was embarrassed, I eavesdropped on a conversation between Mitsuo and Sayuri. When Yoshiyuki sees the two of them laughing at each other, he thinks he's been betrayed.