Tsuyuko Matsumi

Tsuyuko Matsumi (松実 露子 Matsumi Tsuyuko) is the mother of Yuu Matsumi and Kuro Matsumi who died of an unknown cause before the start of the series, but it has left a great impact on Kuro.

Because of her mother wishing her to cherish the dora tiles, Kuro will almost never discard them.

Appearance
Tsuyuko bears a striking resemblance to Yuu Matsumi with Kuro Matsumi's hair color.

Plot
Tsuyuko is only shown in a flashback holding her young daughters hands and her funeral later.

Girls of Yumachi Arc
Harue Akado visits Tsuyuko and her children after winning the regional tournament. While Harue tries to flatter her, Tsuyuko tells her that she only taught her the basics of mahjong.

National Championship Arc
Before the starting ceremony, Kuro remembers her mother throughout the years not letting her help at the Ryokan business. As she is walking with her team, Masae Atago appears and wishes to speak with Yuu and Kuro. She sits down with the girls and tells them that she was friends and rivals with their mother. Masae tells them of the time when Tsuyuko quit mahjong. Tsuyuko tells her that she will give up mahjong as she enters high school because she loves the family business a little more. A little later in life, Tsuyuko tells Masae of Kuro wishing to help her at the business. She says that makes her happy but wants her to focus on other things and come back when she's learned more. She then tells Masae about Kuro being so serious and about her hoarding dora.

Etymology

 * The name Tsuyuko means "dew" (露) (tsuyu) and "child" (子) (ko).
 * Tsuyuko's surname Matsumi means "pine tree, fir tree" (松) (matsu) and "fruit, good result, truth" (実) (mi).

Trivia

 * Tsuyuko had previously taught Harue Akado how to play mahjong.