Araki Gennosuke is a first year student from Ishigami High School and a member of its sumo club. He is the unknown 5th member, as Tsuji didn't see him at Ishigami High. Araki is a tall, buff, young man with light skin. He has gray eyes and black hair which is shaved with various lines running across the top and sides. His mawashi belt is beige in color. He was a national judo champion during middle school. He met Kunisaki Chihiro, thinking Hinomru would be in the dojo, but he when he slept as he waited, Kunisaki Chihiro, who finished his remedial class due to poor grade, slapped him to wake him up. They proceeded to have a match with onlookers. Kunisaki managed to recover from his overhand judo throw, but he was unable to counter attack as the match was interrupted. Before Araki left, he also expresses desire to become an MMA fighter, which he accused Kunisaki Chihiro of copying his career path. It was revealed during the preliminary tournament that he was suspended due to delinquency.