|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.
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.