Mion Sakuragi, who got married just last year. She and her husband were classmates at the same university, and despite both working full-time, they've built a warm and loving relationship. However, she has one major problem: her sex life with her husband has drastically decreased since marriage. Before marriage, he used to initiate sex enthusiastically every time, but now it only happens once a month. Mion has a naturally high sex drive, and this decline has led to intense sexual frustration. Fearing her husband might look down on her, she can't bring herself to ask for sex. As a result, she's increasingly turned to masturbation and has naturally started watching adult videos to cope.