Yuuko Kainou

"Yuuko Kainou" is a second year middle school student as of the Shinohayu timeline. She is the older sister to Yoshiko Kainou.

2nd Children's National Tournament Arc
She appears before Shino Shiratsuki during a break and asks the girl for an autograph. She tells her that her sister is a big fan of hers and wants to help her out. Shino says it's the first autograph she's given. Yuuko then says that this might be worth a fortune later and asks her to be famous.

During the finals she is present with Sora Mineoka and Sayuna Hoshino when Shino arrives. She mentions that Sora has already puked once and that it is a little late for the girl to preserve her dignity. Shino hits first with a dealer's haneman and Yuuko says that she is strong.