“Chinjao Musume” appears in Mankitsu! - Hitomi Kazuki, who is married and living happily, has only one problem. - Her husband's playful younger brother, who comes to visit almost every day, is troubled by his serious eyes. - In the afternoon when her husband was away, Hitomi let her guard down when her brother-in-law offered her a massage as an apology, and she entrusted her body to him defenselessly and was raped. - Her brother-in-law, who had grasped her weakness further, used Hitomi as his partner and taught her pleasure by pouring young sperm into her uterus of childbearing age almost every day.