Miyamoto Rebecca, an 11‑year‑old, becomes the new teacher of a classroom full of eccentrics. Though she appears cute, she is a bit of a beast, often using sarcasm and offensive remarks. With her in charge, the school is no longer safe. Rebecca, along with her students Himeko, Ichijou, Rei, and a white rabbit who has grown fond of her, helps her to stir up chaos in the school and in the neighboring class taught by the teacher known as “ojii‑chan.”