Yurina has made it a habit not to wear a bra at home. Whether it's because she dislikes the feeling of being constricted or simply wants to relax, she has her own reasons. Her father, who raised her, has recently begun struggling with this situation. Although they're family, he finds that constantly seeing his daughter's developing figure at this age is having an adverse effect on both his mind and body. Yet the more he tries to suppress his thoughts, the more unnatural desires keep creeping into his mind. Caught in this emotional conflict, he continues to agonize over how he should navigate his relationship with Yurina.