Original post here. Sourced on tumblr to mono-lover via humancolony.

The image appears to be a crop and a grayscale of a splash page from the manga series Shigurui (“Death Frenzy”) drawn by Takayuki Yamaguchi (b. 1966). Here is what appears to be the color version in original context:

The image, and a chapter of the manga from which it comes, can be found here.