His goal is to become a professional sumo wrestler and yokozuna! Ushio Hinomaru is on his way to visit Ishigami High School, famous for it's sumo program, but arrives at Odachi High School by mistake. There he meets Ozeki Shinya, who trains diligently at sumo, but whose dojo has been overrun by delinquents. Angry that they would defile the hallowed practice area, Hinomaru confronts the leader Gojo Yuma and challenges him to a duel.

Hinomaru is finally doing sumo in school! However, they need five members in order to participate in group tournaments. Ozeki and Hinomaru try to attract new members at club activity day. But Hinomaru's chankonabe stew which he planned to use to generate instrest tastes terrible and the plan fails spectacularly! But one other student thinks the stew tastes delicious! The student is Kunisaki Chihiro from the wrestling club, and he and Hinomaru hit it off well, since they are both in fighting sports.

Tsuji Kirihito has joined the club as a supervisor. The club's first step on the road to the national tournament is facing Eiga University High School in a practice match. The club members don't fully trust Kirihito, but they still go to Eiga High. There, Hinomaru encounters his former rival, National Treasure Kusunagi Sword, Kuze Sosuke.

Early in the morning, Kirihito orders the club members to harvest seaweed and do many other strange things, like standing on an unsteady boat to improve their balance. The club members admire Kirihito's methods, but have doubts about his experience and abilities. They eventually confront him. In order to demonstrate his coaching abilities, Kirihito declares that he will have the rookie Mitsuhashi Kei beat the other club members.

The Dachi High sumo club will be practicing with Ishigami High School in the next down. Ishigami High School is a powerhouse which took second in the Kanto sumo tournament. The former middle school yokozuna, national treasure Mikazuki Munechika, Sada Mitsuki is enrolled there. Hinomaru hoped to fight Sada, but Tsuji gives Hinomaru somewhere else to go. Meanwhile, Chihiro, forced to take remedial class for failing his midterm, encounters a mysterious sumo scout from another school.