The premise has the half-girl half-deer hybrid Nokotan (with antlers) show up as a new student, who then latches onto the seemingly perfect Torako. Nokotan subsequently sniffs out Torako as having ...

After reluctantly assisting her, Nokotan reveals that she is aware of Torako's troubled past and can potentially reveal it to her classmates. From that point on, "Koshi-tan" is obliged to indulge ...