High School! Kimengumi unfolds at Ichiou Junior High, where five infamous boys known as the Kimen-gumi—Rei Ichidou, Gou Reietsu, Kiyoshi Shusse, Jin Daima, and Dai Monohoshi—turn everyday school life into a parade of pranks, misunderstandings, and exaggerated chaos. Each member brings a different flavor of absurdity, and together they disrupt classrooms, corridors, and any plan that dares to stay ordinary.
Their antics soon draw in transfer student Yui Kawa and her friend Chie Uru, who are pulled into the group’s orbit as the school’s rival cliques come into focus. Among them are the glamorous Iro Otoko-gumi led by Shou Kireide, the delinquent Ban-gumi led by You Nihiruda, the athletic Ude-gumi led by Kai Undou, and the tough Onna-gumi led by Jako Amano.
As spring begins, the series follows the fast-paced daily life of these students, using rivalries, crushes, and classroom mix-ups to build a broad comedy driven by personality clashes, constant momentum, and the unruly charm of the Kimen-gumi.