高中一年級的主角宮永咲（濱邊美波主演），是個每次總能夠以正負0分的方式打完麻將牌局的美少女，而她被另一位擁有中學生麻將大賽個人組冠軍戰績的天才原村和（淺川梨奈飾演）的打牌手法觸動，決意加入麻將社中，兩人將以麻將界的頂點為目標揭開這場熱血戰局的序幕。

Miyanaga Saki, a first-year student at Kiyosumi High School, lacks enthusiasm for mahjong and plays it so that it will end with neither a win nor a loss. One day, she is influenced by Haramura Nodoka’s genius mahjong tactics and decides to join the mahjong club. Nodoka is the titleholder of the national junior high school mahjong tournament. Together with Nodoka and the other club members, Saki contends for the title against formidable opponents.