One summer day in her second year of high school, Aki sees her school's boys' baseball team playing in the Koshien (the National High School Baseball Championship), and unable to stand still, she sets her mind to start her own club. One day, Samejima, who used to play for the Japan University of Physical Education's women's softball team, comes to the school as a physical education teacher, and Aki goes to ask her to become the coach of the baseball team...
In Akihabara, Sakura Sakuragi (Yurika Kubo) runs cat cafe "Mocha." She listens to her customers’ troubles there. The various customers that enter her cafe also take comfort in the cats that reside there.
As meninas da Academia Achiga de Nara derrotaram a Escola de Ensino Médio Bansei durante o regional de mahjong. A escola avançou para as semifinais nacional, mas infelizmente perdeu a final do campeonato e o clube foi dissolvido. Depois de seis anos, a estudante da escola elementar Shizune Takakamo fará amizade com a recém-chegada Nodoka Haramura. As duas garotas entrarão na Achiga, mas Nodoka mudará de escola durante o segundo ano. Desde então, tem se passado um ano, e um dia Shizuno vê na televisão Nodoka vencer o campeonato nacional de mahjong para as escolas individuais. Foi aí que Shizune decidiu reviver o clube de mahjong da Academia Achiga.
