After losing his job and returning to his parents' home, Tetsuo is shunned by his family and grows frustrated. His younger brother's wife, Mao, supports him. However, Tetsuo has difficulty finding a job, and unable to resist Mao's sweaty skin, he rapes her. Tetsuo comes to his senses and prepares to leave home, apologizing to Mao, but Mao shows an unexpected reaction. On a tropical night, covered in sweat, the brother-in-law and Mao indulge in lust.