|Japanese name:||山口 大介|
|Debut:||Saki, round 1|
|Voiced by:||Tsuyoshi Koyama|
Daisuke appears to have a fascination with Nodoka Haramura's breasts.
Prefectural Tournament Arc
Daisuke is the first person to suggest a connection between Kiyosumi High School's Saki Miyanaga and Shiraitodai High School's Teru Miyanaga after watching Saki play in the final match of the Nagano tournament.
National Tournament Arc
He was present along with Junko in the tournament halls.