Toshi Kumakura is a professional mahjong player and a supporting character in the manga "Saki" and its spin-off manga "Saki: Achiga-hen episode of side-A". She was previously a scout for a professional mahjong team in Fukuoka. Toshi became a consultant for Miyamori Girls' High School in Iwate Prefecture several months prior to the main story and is very perceptive in the abilities of other players. She is responsible for bringing Toyone Anetai into Miyamori's mahjong team.   ~!As a scout, Toshi had brought Achiga Girls' Academy alumna Harue Akado into the professional mahjong arena.!~   ~!She is highly skilled and was able to defeat the likes of Shiromi Kosegawa, Kurumi Kakura, and Sae Usuzawa with relative ease. She can complete a renchan and used it to put them all below 0 points.!~

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 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.

Special chapters of Saki Biyori serialized in Big Gangan.