A “small” new student, Ushio Hinomaru, appears before the weak little sumo club of Oodachi High School! The words “big” and “heavy” are the rules to this sport, which does not fit this newbie any inch, but this guy goes and does what...!? Ushio and the small sumo club climbs its way to the top! The goal is Hinoshita Kaisan, a title for the highest rank in professional sumo, equivalent of Yokozuna.

A college senior, Shuhei, is blackmailed by a professor into joining the school's sumo team. He is aided by a group of misfits who must team together to defeat their rivals or face disgrace and the disbandment of the sumo club.

An overweight exchange student with no friends decides to join the university’s sumo team at a Japanese university. But in order to get in, first he has to fight the team leader.