Someya Mako

Mako is a second-year student at Kiyosumi High School and plays the sergeant (2nd) position. Mako was introduced to mahjong at an early age as her grandfather owned a mahjong parlor and she regularly visited there (she now works there as a waitress). As a result of this, she picks up her peculiar speech manner and more importantly her special ability; she also received her glasses from him. Nicknamed "Spindle Territory", it allows her to memorize games she has seen or played in so as to be able to recall them in similar situations. She utilizes this when she takes her glasses off.

Mako is a reliable person and a trusting friend, being the only person that Hisa shows her doubts to. She is often snarky when she speaks to Hisa. She was very close to her grandpa growing up and has adopted some of his personality, like the way he speaks. She uses the dialect from Hiroshima prefecture because of his influence. However, she is also shown to be a bit vengeful, as she, along with Tomoki and Miharu, sought revenge against Kaori for defeating them in the prefectural final with her beginner's luck.