A college student “Akira Jogasaki” who has completed the promotion procedure at school suddenly witnesses a mysterious flying object floating in the sky and loses consciousness. When I woke up, it was a place called “Gakuen”, a school building that I had no memory of. The figure of me reflected in the mirror of the is not an adult man, but a high school girl “Saki Arisugawa”. “Ah, don’t worry. I’m still a little confused. I feel like my dreams and reality are mixed. It’s like I was living in a different world.” Where have I gone?