Ryuuka's grandmother

She is the grandmother of Ryuuka Shimizudani and often takes care of her after school.

Personality
She has been described as a very kind and caring person except at the mahjong table.

Introduction Arc(Toki Manga)
She welcomes Ryuuka home and tells Toki Onjouji that she is a nice girl because of the gift she brought. Ryuuka then gets her grandmother to play three person mahjong but warns that she is very strong. After destroying Toki, she tells her not to give up and that next time she might find a way but she will not go easy on her.

Confrontation Arc
In the past, she watches Reika leave for work and tries to talk with Ryuuka but the girl runs away. She later looks on curious as Reika brings home a pet for Ryuuka. She helps Ryuuka feed and take care of the guinea pig and remarks how it has became someone special to her. On one particular snowy day, she tells Ryuuka that she will be going to the neighborhood meeting and will be back late. This was the day that Hamumu (the guinea pig) ended up getting sick and later died. She tries to comfort Ryuuka but to little avail.

She is later seen arguing with Reika about spending time with Ryuuka. After dinner one night, she tries to cheer Ryuuka up with a game of mahjong. Here she will play for herself and Reika while Ryuuka plays herself and Hamumu. The rule is everyone must play their own style. This works well and they continue for some time.

Grandma appears again later encouraging Ryuuka to finally talk to Toki.

Playing Style / Abilities
Several people have commented that she is strong mahjong player and will not go easy on even beginners.