Saki Miyanaga, together with the rest of Kiyosumi High School's mahjong squad, advances to the national stage of the Interhigh Mahjong Championship. Yet climbing to the summit will be tough as she confronts rivals equal to, or perhaps surpassing, her abilities. Nevertheless, she will not retreat, pledging to do everything possible to achieve her aim: to meet her sister again with unwavering hope in person.