Miyanaga Saki, despite being a first-year high school student, has already gained a great reputation by finishing her mahjong games with a perfect zero-point balance. The second main character, Harue Hara, is a girl who won the championship in the individual category at the National Junior High School Mahjong Tournament. By fate, the two of them join the mahjong club and, with the goal of reaching the pinnacle in the high school inter-school competitions, they embark on a series of stories about self-draws and discarded wins.