Tochino Arashi, who is treated as a heel sumo wrestler due to his arrogant personality, continues to win consecutive victories and is finally promoted to yokozuna. However, that night, he suddenly switches with a boy named Makoto Akagi, who threw himself off the bridge because of the bullying. Although Tochino has become frail, he learns the joy of confronting a formidable opponent by being hit by the rough seas of the Hanayama High School, where Makoto used to go to.

Mineva Lao Zabi is a baby in the Zabi family. Her father Dozle Zabi is a military general for the space army but is the biggest bonehead. Mineva's mother Zenna Zabi is just as dense and causes Mineva the biggest headache on a daily basis. This series follows the Zabi family and Mineva’s struggle with her parents who both have a screw loose.