Yuji moves to the city to start a new life. He immediately decides on a seemingly ordinary apartment shown to him by a real estate agent—the reason being that he can clearly see into the neighboring apartment, where a beautiful, big-breasted married woman lives. Ever since moving in, Yuji finds himself peeping into her room every day, making a habit of watching her as she moves about the house in private, unaware. One day, he catches her masturbating. Lost in the moment as he watches, he suddenly makes eye contact with her. At that instant, the story takes a dramatic turn.