Kato and his neighbor decided to go on a weekend retreat at a hot spring resort with their wives Kanako and Reika. However, Reika often feels unsatisfied and frustrated because whenever she desires intimacy, her husband always finds excuses to avoid it. This even happened during their retreat, which made Reika angry. She confided in Kanako, who, strangely, became interested in intimacy with Kato. At the same time, in the other room, Reika was expressing her pent-up desires to Kanako's husband.