Jansou no Saeko-san  

Miss Saeko in a mah-jongg parlor, 雀荘のサエコさん

4-koma manga about the daily life of a clumsy jansou clerk that happens to be a powerful mahjong player.(Source: MU)

Jansou no Saeko-san was originally serialized in Kindai Mahjong Original from April 7, 2012 (2012-05) to November 8, 2013 (2013-12). It was then moved to Kindai Mahjong on December 16, 2013 (2014-01-15 issue).