Hiroshi, my brother-in-law, is stuck living at his parents' house due to the difficulty of finding a job. He's shunned by his family and ridiculed by his younger brother, and this humiliation is exacerbated by the summer heat. Hiroshi directs all his frustration towards his beautiful sister-in-law, Ai... He steals glances at her sweaty sleeping form, and when the family is out, he finally rapes her. Sweaty rape sex. The kind-hearted Ai can't tell anyone, and she gradually becomes submissive to Hiroshi's desires...
