清水谷 竜華

Ryuuka is a third-year at Senriyama Girls' High School. She is the best friend and caretaker to Toki Onjouji. Ryuuka is a cheerful type girl and is pretty close to Toki. She always takes care of Toki like a mother and constantly watches over her so that she does not push herself too hard. Since meeting Achiga she seems to have grown fond of them as well to the minutes that she does not know to root for her team or Achiga.

It is noted that on a per-game basis, Ryuuka has the highest point gain average in her region. This is due to her precise play and highly accurate predictions. In the semifinals, Ryuuka discovered that she has the ability to connect with Toki, in a fashion possibly somewhat similar to Shindouji's Shirouzu and Tsuruta. Connecting with Toki gives her the ability to see the final composition of the hand she is to win with, as well as the order of discards she requires to achieve this.