Tatsuhiko Kimura

Natsumi's uncle and a former billiards champion. He refuses to teach Tomu, because he feels gambling is wrong. He is soon bested by Gokijima, a hustler, who has no qualms teaching Tomu, for the right price. After some persuasion from Natsumi, he helps in on of Tomu's tricks by chasing Gokijima away from Tomu and Rio's match which plays a large part in Tomu's victory.