Saki Miyanaga detests mahjong due to her past, opting to fly under the radar when indulging in the game. However, after being reluctantly brought to the school's mahjong club by her friend Kyoutarou Suga, she encounters Nodoka Haramura, the former middle school mahjong champion, and Yuuki Kataoka. Despite trying to conceal her skills during club matches, Saki's unique style catches the attention of the club president, Hisa Takei, who tests her true capabilities. This unexpected talent revelation strains Saki's budding friendship with Nodoka. Eventually, Saki joins the club, reconciles with Nodoka, and a bond forms between them. As Saki rediscovers her passion for mahjong, the club embarks on a shared mission—to triumph at the national competition!