Airi Kijima has a rather unhappy life with a husband who is constantly indifferent to her, so she begins to seek another man to have an affair, to help satisfy her. One day, while she is on a date with her new boyfriend, and they are on their way to a couples' hotel, her husband unexpectedly sees them and secretly follows them to the hotel. Her husband books a room right next to his wife's room with her lover; in the adjacent room, he presses his ear against the wall to listen to the moans coming from the other room, he can't believe what is happening. But that is just because he has a beautiful wife but doesn't know how to keep her, and now he regrets it...