Two couples dissatisfied with their sex lives are drowning in excitement far removed from their daily lives... The wife of Tetsuya, who is very interested in swapping, proposes it to the friendly couple, Kiyoshi and Misato. At first, the husbands could not hide their confusion, but they could not suppress their excitement at the sight of their wives being messed up by other men. The obscene acts that take place without regard to time or place escalate beyond the boundaries of the couple. Shyness turns into excitement, and desire drowns in pleasure without knowing when to stop. The two couples who have experienced a new excitement are invited to a new world through "swapping"...
