Teru is a third year student at Shiraitodai High School. Teru is Saki's older sister, who went to live with her mother when their parents separated. She has since become a powerful mahjong player, rumored to display fearsome powers. She used to play with Saki Miyanaga and the rest of the family when they were younger. Saki dreams of progressing to the nationals and finally reuniting with her, but Teru denies her existence. It is still unknown as to why she is mad at Saki. Teru and Shiraitodai have won the past two individual and national team tournaments, and aim to repeat both wins this year.
In the first hand of games, Teru almost never wins as she surveys her opponents with her Shoumakyou or The Mirror ability. With this she is able to see her opponents' innate abilities. However, after this she goes on long win streaks with the hands increasing in value. The momentum of her wins build up on her right arm, appearing as a small tornado. Having to increase the value of her hands may force her to make risky moves. Teru may also have a The Nine Gates or Nine Lanterns ability, which consists of a single-suited, concealed hand composed of 1112345678999. It can go out on any of the nine tiles from the same suit.