Nanami, a beautiful wife living with her husband who is a germaphobe, is raped one day by her husband's boss, Sugimori, who comes to visit her while her husband is on a business trip. The experience of having his penis forcefully thrust into her vagina and having muddy semen poured into her again and again instills in Nanami the feeling of being "defiled." Taking advantage of her weakness of having lost her chastity, Sugimori makes Nanami his plaything again and again. However, Nanami, who is stressed by her husband's germaphobia, is eaten away by the sensation of dirty liquid being released into her body...