Mikiko who got married to her husband who runs a construction shop, but had an affair with her husband's subordinates due to frustration. One day she was absorbed in SEX, and her husband's stepchild, Toshihiko, revealed the secret. Mikiko is forced to take advantage of her weaknesses and be forced to follow her. Although she refused and begged, she had no escape and finally got her son-in-law's penis in her mouth. Mikiko gradually loses her reason while being relentlessly violated by being called a "sex slave".