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Mutsuki Tsuyama (津山睦月)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.