Despite not being human themselves, these young women have an intense fascination with humanity. As Rei Hitoma, a 30-year-old woman near the end of her high school years who has struggled with relationships in the past, you find yourself at an unusual school that aims to transform non-humans into humans. Your days are spent interacting with your classmates, including Kyouka Minazuki, a mermaid; Isaki Oogami, a werewolf; Sui Usami, a rabbit; and Tobari Haneda, a bird. You are eager to learn about humanity through their experiences and perspectives. This story is not about isekai fantasy or reincarnation; rather, it is a unique exploration of what it means to be human through the eyes of these extraordinary young women.