After triumphing over regional mahjong powerhouse Bansei High School, Achiga Girls' Academy in Nara made it to the national team semifinals. Unfortunately, they fell short to the ultimate champion, leading to the dissolution of the mahjong club. Fast forward six years, young Shizuno Takakamo forms a friendship with transfer student Nodoka Haramura. They both enroll in Achiga Girls', yet Nodoka departs in the second year. Upon witnessing Nodoka's victory as the national middle school individual mahjong champion the following year, Shizuno resolves to breathe new life into Achiga's mahjong club.