Hiroko Murohashi is a third-year student at Takatoobara Middle School in Nagano Prefecture and a supporting character in the "Saki" manga. She is a former teammate of Nodoka Haramura and Yuuki Kataoka in the previous year's prefectural middle school mahjong tournament. Because she is often seen together with younger teammate Maho Yumeno, Yuuki calls them the "Muro-Maho Combination".  In the first anime series, the Hiroko and Maho attend Nagano's prefectural high school tournament to see Nodoka's final match. In the manga, the two do not attend and are instead invited by Hisa Takei to Kiyosumi High School's national tournament training camp.

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)

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)

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

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