The defeated person has to wrestle with the Sekitori-dan (a group of former sumo wrestlers), but Hikari, who was the first (and only) member of the Sudori-dan to suffer his 20th defeat, was converted into a sumo rider by the Sekitori-dan because he always took sumo. It is a spin-off project from there. The content is that Sumo Rider goes to use it as a pasiri of the Sekitori team and executes the embarrassing orders of the Sekitori group.