"Chinese Girl" appears in Mankitsu! Hitomi Hitomi, who is happily married, has only one problem. Her husband's frivolous younger brother comes to visit almost every day, but Hitomi is a serious Hitomi and it's a headache for her. One afternoon when her husband is away, her brother-in-law offers to give her a massage as an apology, and Hitomi, who is not careful, entrusts her body to him unprotected and gets raped. Her brother-in-law, who has a hold of her weakness, makes Hitomi his sex buddy and teaches her pleasure by pouring his young sperm into her uterus of child-bearing age every day.