Miyanaga Teru♀

Teru is a third-year and the leader of Shiraitodai High School. Teru is Saki Miyanaga's older sister, who went to live with her mother when their parents separated. She has since become a powerful mahjong player, sometimes displaying fearsome powers until the fact that people began classify her as the strongest among all monster players. She used to play with Saki and the rest of the family when they were younger. Saki dreams of progressing to the nationals and finally reuniting with her, but Teru lies to teammates and reporters alike about not having a sister. It is still unknown as to why she is mad at Saki. Teru won the last national individual tournament, Shiraitodai won the past two national team tournaments, and they aim to repeat both wins this year.
Teru is dispassionate and almost emotionless when she is with her teammates but smiles widely during a press conference, a smile that Sumire realizes is fake. Teru harbors anger towards Saki for unknown reasons. When she used to live with Saki, she was the typical cool older sister - encouraging Saki to bloom like flowers on a mountain. Even though she is somewhat cold, she has shown care to her opponent like the time when she's worried about Toki Onjouji after she is being sent to hospital.

In the first hand of games, Teru almost never wins as she surveys her opponents with her mirror ability. With this she is able to see her opponents' innate abilities and habits. This makes her very astute, and allows her to easily counter her opponents. After using her mirror, she begins her reign. When she wins one hand, her next hand will be stronger than the last. However, she must win with a higher value in order to keep her ability active (this includes renchan bonuses but Teru doesn't rely on that; it is likely riichi bets do not count), this may delay the completion of her hand as she begins making more difficult yaku. Her winning with a lower value hand than her last one, anyone else winning, and exhaustive draws will break her streak, causing her to start again from the bottom. He beginning hands start out regularly, but her draws make her hands come together strongly and quickly. The momentum of her wins build up on her right arm, appearing as a small tornado.