Premier member of the reigning champion Mahjong team,  Ryuumonbuchi, and one of the most idolized yet feared players in the game. She is said to be possessed by a demon when playing; she even outranked a professional Mahjong player at a previous tournament. She is also the key player that brings an end to Kazekoshi's winning streak. She has a bad habit of wanting to crush her opponent's pride.   ~!Her mahjong playing style pressures her opponents and her abilities can prevent them from reaching tenpai. This, together with the mahjong move she favors most, Haitei Raoyue or "last tile win" is a combination that slowly drives her opponents into despair. Haitei Raoyue's literal meaning is "to scoop up the moon from the seabed." Her abilities include being able sense when her opponents are in tenpai and the approximate value of their hands. She usually goes for big hands.!~  She is Touka's cousin, their relationship akin to those of siblings due to the amount of time they have spent together. She prefers to not be seen as a child, despite their small stature and her childish personality. She acts in a very friendly manner, always wanting to make friends with everyone she meets and in hopes of being treated lovingly.   ~!This desire most likely roots itself from the fact that her parents died early in her life, leaving her alone under the supervision of the Ryuumonbochi family. She is kept isolated for vague reasons; Touka mentioned that she was told by Koromo's Father to particularly "not get close to her". Despite this, she appears to hold quite a strong, stable relationship with Koromo.!~

Miyanaga Saki is a first year high school girl whose family would get angry if she won the family mahjong games. But losing would also have its consequences. Because of this she develops a new way of playing that allows her to stay on the thin line between winning and losing, the plus/minus zero score, an almost impossible score. In a game that relies mainly on luck, the plus/minus zero score is harder than winning, but Saki can achieve this every time. Having always hated the game, her friend from middle school, Suga Kyotoro, forces her to play in the schools mahjong club. Her developed skill and superhuman luck has made her a worthy mahjong opponent, even to the middle school's national mahjong champion. (Source: Anime News Network, edited)

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Saki's never been a big fan of mahjong. A lifetime of being forced to play with family at holidays (and losing her money as a consequence...) has left a foul taste for the game in her mouth. When she's convinced, though, to play a game with her classmates, she discovers that not only has fending off her family left her with an uncanny ability for the game but, more surprisingly, that it can even be fun!
 
Is this revelation enough to cleanse Saki's distaste for the game? Can her classmates convince her to join their club, or is there just too much baggage to make it worth her while?
 
(Source: Yen Press)

The Achiga Girls' Academy in Nara once defeated regional mahjong powerhouse Bansei High School. It advanced into the national team semifinals but lost to the eventual champion, and the mahjong club was later disbanded. 
Six years later, elementary school student Shizuno Takakamo befriends transfer student Nodoka Haramura. The two eventually enter Achiga Girls', but Nodoka transfers out of the school in the second year. 
When Shizuno sees Nodoka on television the following year as the national middle school individual mahjong champion, she decides to revive Achiga's mahjong club.

After their success in the regional tournament, the Kiyosumi High School mahjong team faces off against a whole new level of competition at the National Tournament in Tokyo. (Source: Anime News Network)

The final 4 episodes of Saki: Achiga-hen - Episode of Side-A.

The Achiga Girls' Academy in Nara once defeated regional mahjong powerhouse Bansei High School. It advanced into the national team semifinals but lost to the eventual champion, and the mahjong club was later disbanded. Six years later, elementary school student Shizuno Takakamo befriends transfer student Nodoka Haramura. The two eventually enter Achiga Girls', but Nodoka transfers out of the school in the second year. When Shizuno sees Nodoka on television the following year as the national middle school individual mahjong champion, she decides to revive Achiga's mahjong club.

Specials included in the DVD volumes 3 through 9 and Blu-ray Box that recounts stories that take place before, during, and after the first season of the anime.
 
(Source: Saki Wiki)

A single episode OVA released with the 14th volume of the Saki manga, consisting of 4-koma gags featuring characters from the first season. The two pros meet up at a family restaurant. The captains of the four teams prepare for a joint training camp. Ikeda keeps her little sisters occupied. The Tsuruga team goes on an unplanned camping trip. Ryuumonbuchi celebrate Koromo's birthday.
 
(Source: Anime News Network)

Saki spinoff focusing on Someya Mako as she cooks meals for customers of her family's mahjong parlor. 
 
(Source: Japanese Publisher, translated)

Side stories of the "Saki" manga in 4-koma format. 

Note: Chapter count includes 7 omake chapters, 1 from each Volume.

Special chapters of Saki Biyori serialized in Big Gangan.

Koromo Amae