Hiromi, a reclusive young man, wakes up one morning to discover that his body has mysteriously transformed into that of an attractive woman. Struggling to understand his new identity, he navigates daily life while confronting harassment, attention, and social expectations that come with being a woman in contemporary Japan. Guided by a parapsychologist who claims his condition is an ancient “feminization disease” and warned by a gender scholar about societal risks, Hiromi—now Yūmi—experiences the world from a completely new perspective. As he explores work, relationships, and online interactions, Yūmi must reconcile the pleasures and dangers of living as a woman, discovering how deeply gender shapes personal freedom, desire, and vulnerability in a society that treats men and women very differently.