The son of a Japanese confectionery store owner and a member of Eisen Private High School's swimming club. In junior high school, he won third place in the national 100m freestyle championship three years running. Because he isn't satisfied with third place, he switches to the breaststroke at the beginning of high school. However, his coach convinces him to switch back to the 100m and 200m freestyle. His main problem is with his starts, but he improves after studying how Nakanishi swims.