During her school days, Yashiro Nonoyama's deep-seated fear of males stemmed from relentless bullying. Now in high school, she yearns to reunite with her first protector: a girl who shielded her from torment. Yashiro's world is shaken when a new transfer student, Mikoto Saionji, bears a striking resemblance to her savior, only to reveal that he is, in fact, her long-lost crush. To her astonishment, Yashiro discovers that Mikoto is undergoing a rapid gender transformation, and the remedy lies in their daily, passionate kisses.