"Saki" centers around the competitive world of mahjong, blending elements of sports, strategy, and supernatural abilities. The protagonist, Saki Miyanaga, is a high school student with a complicated relationship with the game due to her family’s dynamics. Despite her aversion to mahjong, Saki possesses an extraordinary talent for the game, particularly in manipulating scores to end matches with a zero-sum outcome. This skill stems from her childhood, where she played mahjong with her family and developed a unique style to avoid conflict.

The narrative begins when Saki is recruited by her classmate, Nodoka Haramura, to join the mahjong club at Kiyosumi High School. Nodoka, a former national middle school mahjong champion, recognizes Saki’s potential and encourages her to embrace her talent. Together with other club members—Yuuki Kataoka, a cheerful and energetic player; Mako Someya, a reserved and strategic thinker; and Hisa Takei, the club president—they aim to compete in national high school mahjong tournaments.

As the story progresses, Saki and her teammates face off against rival schools, each with their own unique and often supernatural mahjong abilities. These abilities range from probability manipulation to clairvoyance, adding a fantastical layer to the traditional game. The matches are intense and strategic, with a focus on teamwork, individual growth, and overcoming personal challenges. Saki’s journey is not just about winning but also about reconciling her past and finding joy in the game she once despised.

Key characters include Koromo Amae, a mysterious and powerful player with a dark aura; Teru Miyanaga, Saki’s older sister and a dominant figure in the mahjong world who serves as both a rival and a source of internal conflict for Saki; and Kana Ikeda, a rival player with a cheerful demeanor and a competitive edge. The series explores themes of friendship, rivalry, and self-discovery, all set against the backdrop of high-stakes mahjong tournaments.

The plot is driven by the team’s progression through regional and national competitions, with each match revealing new strategies, character backstories, and the evolving dynamics between players. The series balances intense gameplay with moments of humor and camaraderie, creating a compelling narrative that appeals to both mahjong enthusiasts and newcomers to the game.