Ryu, the wife of Haruo, an elite businessman. Her brother-in-law Toshio, who lives with her, was laid off and is looking for work. Haruo goes on a business trip and Toshio is in a hurry to find a job, but he can't help but be drawn to Ryu's voluptuous body, which he sees in his daily life, and sneaks into her room at night. Ryu hates air conditioning, so their sweaty sex is full of sex appeal.