Rebecca Miyamoto, at the tender age of 11, takes on the responsibility of teaching a class brimming with misfits. Despite her innocent appearance, Rebecca possesses a sharp wit and a penchant for unkindness. Under her guidance, the classroom erupts into chaos and spills over into the adjacent room where the elderly "ojii-chan" teaches. No longer is the school a sanctuary under Rebecca's severe and authoritative rule; even her students, such as a cute white bunny, band together to cause mayhem.