Yuri na Watashi to Akuma na Kanojo (?)

Yashiro Nonoyama endured bullying from boys as a child, which led to a deep fear of men. In high school, she longs to reconnect with the girl who once defended her. When a transfer student named Mikoto Saionji arrives, Yashiro is shocked to find him resembling her first love. She soon learns that Mikoto is male and indeed her former love. As Mikoto undergoes a transformation into a girl, Yashiro discovers that the only way to reverse this process is for them to kiss passionately each day.