Kaku Goshogawara is the founding member and driving force of Musashi Mountain High School's sumo club. As the sole initial participant, he actively recruits four others to meet competition needs: judo team captain Kaoru Kiyokawa, pro wrestler Takayuki Kannai, self-styled delinquent Ippei Nanno, and physically imposing yet shy Go expert Gorou Raiden.

Once the team forms, Kaku Goshogawara coordinates their joint training regimen and leads the group's preparations for competitive sumo. He guides the club through their participation in a formal tournament, where they face a professional sumo organization. His profile tags reflect his deep association with the sport: athlete and sumo wrestler.