Super Real Mahjong is a old (90's) game who became a serie with many sequel, I made a little research, seems like the last was on the GBA in 2002-04. This girl is Etsuko Toyohara (豊原 エツ子), seems like she is a minor character in the game but have her own story. In the hentai anime "Shimaizuma" there is a character who resemble her, I would say a twin, but that one is a bitch. I really like this girl.