Lazy, uneducated students mostly coming from money, share a very close band. They live together in the dormitory of this private highschool, where they daily plan their latest pranks on teachers or the other classes. When a new and obviously strict headmaster arrives, the students naturally try to overthrow him. A comic war of nitwits follows.

A sincere and hardworking student joins the Chaos Class, but acceptance seems unlikely when he becomes the target of their pranks.

Lazy, uneducated male students mostly coming from money, share a very close band. They live together in the dormitory of this private highschool, where they daily plan their latest pranks on teachers or the other classes. Because of the financial crisis, the headmaster agrees to enroll female students. As the new students try to fit in, a struggle between both parties start, trying to prank the other part away. The prank war continues until PE-Teacher decides to take the class out on a trip for a becoming scouts.

A young and beautiful female teacher starts working in an all boys high school.

Lazy, uneducated students mostly coming from money, share a very close band. They live together in the dormitory of this private highschool, where they daily plan their latest pranks on teachers or the other classes. When one of the students get his girlfriend pregnant, the whole class acts together to help him. The mother has to leave the baby for a while with the father, and this leads to a series of funny events.

Lazy, uneducated students mostly coming from money, share a very close band. They live together in the dormitory of this private highschool, where they daily plan their latest pranks on teachers or the other classes. Especially, the new teacher for literature receives his share.