Kuro Matsumi

Kuro Matsumi (松実 玄, Matsumi Kuro) is a protagonist in the spinoff Saki Achiga-hen episode of side-A. She is a second year at Achiga Girls' Academy and the younger sister if Yuu Matsumi who was the children's mahjong club's number one player before it was disbanded. Afterwards, she kept the room clean for two years in hopes that someone would show up and they could have fun together like they used to.