Kuro Matsumi is a second-year high school student at Achiga Girls' Academy in Nara Prefecture and is a protagonist in the spin-off manga "Saki Achiga-hen episode of side-A". Before the club was disbanded, Kuro was its number one player. She kept the room clean in hopes that someone would eventually return to the club. She is the younger sister of Yuu Matsumi.
Kuro's abilities are briefly commented on. During a match with Nodoka Haramura, Ako states that it was never possible to her to get any dora because they all gather toward Kuro. Because of this she has earned the nickname The Dragon Lord. The downside to this is that she can't discard any dora. If she does, Kuro will not be able to get a single dora for several games.