Can you name a few notable examples of 'underground' Japanese comic artists or series that might be found on Mangadex?

Finding definitive lists is challenging due to the nature of 'underground' works. However, artists/series often associated with the underground scene include those exploring psychological themes, surrealism, or experimental narratives. Look for titles by artists known for avant-garde or highly personal works, often found through community recommendations within the Mangadex platform. Specific names change frequently, as these artists often operate outside mainstream publishing.