Saki Miyanaga

Saki Miyanaga (宮永 咲, Miyanaga Saki) is the titular character of the story. She is a first-year student at Kiyosumi High School who is notorious for her ability to break even in every match, as she didn't want to win against her family. However, after joining the mahjong club, she uses her skill for the sake of winning and hopes to progress to the nationals to reunite with Teru Miyanaga. At first, she is distant towards Nodoka Haramura, but she becomes extremely close to her (to the point where they frequently hold hands and draw strength from each other) over time. She gets easily distracted and has a poor sense of direction, which causes her to get lost during excursions, particularly in tournaments. After her performance in Nagano prefectural and the eventual defeat of Koromo Amae, people begin considering her as one of the feared national-class monsters.