|Japanese name:||門松 葉子|
|School:||Imamiya Girls' High School|
|Grade:||Second-year high school|
|Debut:||Saki, round 8|
|Voiced by:||Shiori Mikami|
Youko Kadomatsu is a second-year student and vanguard of the Imamiya Girls' High School mahjong team.
Youko has medium length blonde hair tied in the back and brown eyes. She wears the standard Imamiya Girls' uniform and earrings.
Playing Style / Abilities
Youko claims to be the fastest player in her area.
Prefectural Tournament Arc
Youko first appears with Mai and talks about how bad their first round opponents are and how easy their win will be. They then start to talk bad about Nodoka. In her match against Yuuki Kataoka in the first round, Yuuki caught her off guard and was able to defeat her completely. Later she admits that Yuuki was strong in the east wind but only figured it out when the match was over.
After a late night of karaoke, she returns to the tournament hall with Mai Tanaka and takes Nodoka Haramura's stuffed penguin as a prank. However she drops the penguin from fear of getting caught by Yasuko Fujita. She soon regrets the prank, and goes to apologize to Nodoka.