In this world, everyone is assigned an animal and a rank (ABO) since birth. The animal a person is assigned to is the animal they can turn into. The ranks are Alpha, Beta, and Omega. All schools had an extra subject called animal forms, where kids learned how to behave in their animal form.

Nora's animal was an Omega bunny, which he was ashamed of since he is rather weak and low ranked.

Nora was in math class when the teacher announced the arrival of a new student...