Yukimi Kobayashi spends most of her time alone, but that isn't the strangest thing about her. Yukimi is actually an experimental android that has been placed in school to allow her to develop like a normal child. However, Yukimi didn't always spend her time avoiding people; she used to have many friends. What are the secrets behind Yukimi and why has her personality changed so much? Perhaps the only person who can help her is her teacher.