This is a posable action figure from the Nendoroid series.
From the Good Smile website:
From the anime filled with cute girls and mahjong, "Saki: Zengokuhen" comes a Nendoroid of Saki Miyanaga! She comes with three expressions including a smiling face, a focused face and a lost expression about to burst into tears! She also comes with a number of optional parts from the series including a mahjong table, replacement tile effect parts and a lightning effect part!
Additionally she also comes with both her long skirt for the national tournaments as well as her mini-skirt used in the prefectural matches! Be sure to display her with the previously released Nendoroid Nodoka Haramura for even more fun!