The midsummer sun is beating down on Mikito, his brother-in-law, who is frustrated by his failure to find a job. He takes out his frustrations on his younger brother's wife, Sayuki, who lives with him, and rapes her while the family is away. They have passionate sex covered in sweat. Sayuki resists, but when Mikito sees an opportunity to attack her, she gives in to his desires and before she knows it, he is thrusting into her again and again, making her sweaty and climaxing over and over again.