Worried about her son's education, Mai Fuyuki suggests hiring a private tutor while teasing her husband with erotic advances. The tutor turns out to be Hashimoto, her former classmate from ●● High School. As they reminisce about old times, the atmosphere gradually shifts. Having secretly loved Hashimoto in the past, Mai begins to open her heart to him. One night, her affair is discovered by Ichiro, her husband's friend. Later, her drunken husband returns home supported by Ichiro and immediately falls asleep. Left alone together, Ichiro reveals that he knows about the affair. Overwhelmed with shock and confusion, Mai can't hide her emotions as Ichiro threatens to expose everything to her husband.