Avsnitt 1

Three years after her resignation from Kurogin Academy, Yankumi returns as the new homeroom teacher of Akadou Academy's 3-D! Upon her arrival, she discovers that the class is full of delinquents, and is divided into two opposing groups that are always at each other's throats . One of the students, Kazama Ren, is suspected to be behind a series of muggings, and while the rest of the class doesn’t seem to care about his predicament, Yankumi resolves to prove Kazama's innocence.