"W-Wow... So this is what you like Yuki-kun..."
Yuki, a first-year college student, ends up living with his cousin Nanako, who was kicked out of her parents' house after failing the college entrance exams two years in a row. On the first day of living together, Yuki's secret fetish, something he couldn't tell anyone, gets exposed. Using that as leverage, Nanako starts pressuring him into both studying and engaging in intimate activities. Despite initially holding back because they are distant relatives, Yuki gradually starts losing his self-restraint...?