In the Hajime no Ippo series, Ryogoku Kokugikan is the place of most of the competitions organized.
Ryogoku Kokugikan is a sumo arena that was originally built in 1909. The current building, which serves as a multifunctional facility, was completed in 1985, and three of the six annual sumo tournaments in Japan are held here. When a tournament is underway, the Ryogoku area comes alive with decorative banners bearing the names of wrestlers, the sound of taiko drums, and the sight of wrestlers walking the streets. The number of foreign-born wrestlers has increased notably in recent years, and the sport of sumo is continuing to become more international. On the first floor of Ryogoku Kokugikan is a sumo museum. Admission is free, and the museum displays a number of unusual sumo-related objects and artifacts, such as sumo banzuke (ranking lists) dating from the Edo period and keshomawashi (wrestlers' ornamental sashes) used by great wrestlers.