Saki Miyanaga is a first-year student and is the titular character of the story. She initially joins the mahjong club so she can reach the Nationals to see her sister, a top-ranked professional mahjong player.She is notorious for her ability to score zero points every round, as she didn't want to win against her family.However, after joining the mahjong club, she uses this skill for the sake of winning. Her skill primarily comes from her ability to read her opponents and their tiles to see the flow of the game.