Sukoya Kokaji is a professional mahjong player and a supporting character of the manga "Saki" and its spin-off manga "Saki: Achiga-hen episode of side-A". She provides commentary alongside Kouko Fukuyo during the East Tokyo prefectural qualifying tournament and the national tournament. She is also a friend of professional player Yasuko Fujita.  Although she is a skilled player, Sukoya does not play in many ranked tournaments, thus her world rank remains at number 973. She previously earned a silver medal in a freestyle tournament in Rio de Janeiro and was a member of the national high school tournament champion team ten years prior. She is the youngest person to hold eight titles in mahjong and was seen on the way to winning a record eight titles four years prior to the main story.  ~!During her national high school tournament championship year, Sukoya Kokaji who plays for Tsuchiura Girl's from Ibaraki, defeated Achiga Girls' Academy's Harue Akado in the semifinals. She and Yasuko are among the few who are aware of the strength of Achiga's new mahjong team, which Harue coaches, after viewing its national quarterfinal match.!~ According to her Pro Mahjong Card, her eights' title is called "Seven Eternal Crowns".  She is also formerly world's # 2. She was MVP every year when she played for Ebisu and is currently undefeated in Japan.

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.

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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.

A prequel to the Saki series, focusing on the childhoods of future professional mahjong players and their peers, among them Shino Shiratsuki, a young girl with an affinity for the 1-sou who is seeking out her missing mother.

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.

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)

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.