Akari, a married woman who gets married and lives at her husband's parents' house. My brother-in-law who came home temporarily because the writer's work did not go well to such a husband's parents' house. One night, his brother-in-law, who has spent his days in agony both at work and in his private life, witnesses the night life of his younger brother and his wife. The sweaty and ripe body was dazzling due to the sweltering summer heat, and my brother-in-law lost his reason. Akari is attracted to her brother-in-law for some reason though she can't stand it and commits her sister-in-law. On a tropical night, the two are covered in sweat and body fluids and have sexual intercourse.