One ordinary morning, an average high school boy named Hirakawa Asahi turns on the TV in the living room, just like he always does. The news begins airing a report from a hot spring, and it seems like another completely ordinary day is about to begin. That is, until a topless female reporter appears on screen... Asahi soon discovers that society's views on male and female chastity have been completely reversed. Though bewildered at first, he tries his best to adapt to this upside-down world. Then, one of the most popular girls in his class, Sotogahama Riria, confides in him that she has no experience with men— "Hirakawa-kun! Please! Just let me do it once!" A chastity-reversed youth romantic comedy begins, with a charming heroine aggressively pursuing him!