Aki is a beautiful wife who lives a wealthy and comfortable life. However, her relationship with her husband has become cold, and she feels lonely and frustrated. Aki's neighbor, Kita, is ill and has been given a prognosis for his remaining time, leading a lonely life. One day, Aki looks after Kita when he collapses. He is Kokoro by Aki's resemblance to his deceased wife, and breaks into her house and kidnaps her. The two, who are growing increasingly lonely deep down, reach a state of Kokoro at the end of their obsessive, loving sexual intercourse... It is an animal-like mating that takes place in a depressing apartment.