One day, while playing at Shinya's house, Daisuke notices that Shinya's mother, Reiko, has a different vibe than usual. Daisuke feels seduced by her sexy underwear, which is visible through the gaps in her clothes, and he feels awkward and runs away from the scene. However, Daisuke suddenly realizes that he has left something behind. When he rushes back to get it, there is a suspicious atmosphere at his friend's house. To his surprise, Reiko and Shinya are touching each other. Daisuke cannot take his eyes off the sight... and by chance their eyes meet. Daisuke panics and runs away again.