Due to the difficulty of finding a job, my brother-in-law Hiro is staying with us. The midsummer heat intensifies the humiliation of being shunned by his family and mocked by his younger brother. Hiro's frustration is directed at his younger brother's beautiful wife, Ai... He sneaks a peek at Ai's sweaty sleeping figure, and finally rapes her when the family is away. Sweaty rape sex. Ai is unable to tell anyone about her kind nature, and is gradually consumed by Hiro's desire and becomes submissive...