Riki is a 3rd year student and the banchō (delinquent leader) of Hanazono High School. He is Kunio's rival and best friend, and like him he takes the role of helper in various sport clubs at his school, which grants him praise from his peers and juniors at the school. Before becoming the banchō of Hanazono High School, Riki was the ace of his school's soccer club. The biker gang Mushamonzen attacked members of the club, and Riki built his legend as "Mach Punch Riki" by destroying the biker gang in revenge and taking the position of banchō from Sakata. However, this came at the cost that he was not only removed from his school's soccer club, but he was forced to repeat his senior year. Soon after, he had his first encounter with Kunio and was defeated. In this game, he and Kunio get sucked into a mysterious portal prompting his bubbly girlfriend, Kyoko, and her best friend Misako to go frantically search for them.

He sounds calm, cool, and serious, as if he's not easy to be provoked or intimidated.