Yuichi was attracted to Nao, who was always dressed in a provocative fashion and had a sex appeal that made it hard to believe that she was her mother's best friend.Nao, who has the worst relationship with her husband, comes to her house occasionally and complains about her, but on this day her mother is away and Yuichi has to listen to her complaints.Then, her complaining about Nao gradually escalates in an unexpected direction, creating a mysterious atmosphere.Then Nao whispered to Yuuichi with her bewitching smile. "Keep this a secret from your mother."