Saka and Ikuo have been married for two years. Recently, Saka called a friend to ask why her husband hadn't invited her out at night, but her uncle Kiyoshi, who lives in the same apartment building, overheard and forced her to have a sexual relationship. Although she knew she shouldn't do it, she was swayed by curiosity and Kiyoshi's forceful attitude, and Saka fell into a swamp of pleasure…