Born female, Asahi Mizuno was raised as a boy due to her parents' strict upbringing, living day to day with her true identity hidden from everyone. However, one day a male bully discovers her secret and forces her to submit sexually in exchange for keeping quiet. As a result, she loses her virginity and becomes the target of attention across the school, used as plaything by the male students. Deep inside, she begins questioning her upbringing as a boy, while her body starts experiencing the pleasures of being a woman—sensations that grow increasingly difficult to control. This inner conflict and the new feelings she discovers become the turning point that drastically changes her life.