Mutsuki Tsuyama

津山睦月

Mutsuki Tsuyama is a member of Tsuruga's mahjong team. She was one of the members who played online with Satomi and Yumi when they found Momoko through the school's network. She is a serious player and a serious person. She later becomes the president of the mahjong team as both Yumi and Satomi are in their third year and will graduate.