Shamo is a Japanese action Manga with a really dark theme. It is no longer around because the company called Weekly Manga Action went out of business. The story behind this is a boy who killed his parents and somehow turned himself into a killer martial artist. The story line was then used in 2007 for a film produced in Hong Kong. The basic story behind the shamo manga is after he kills off his parents he commits all types of horrible crimes including murder and rape.
The theme throughout this story is how once someone gets into the crime system there is really no reform ever given. The criminal just kind of skates through existence without any help with reform. It also points out how society is immune to the criminals need for help and as many societies do, they shun him instead. This story was actually based on a true event that happened in 1997. In 1997 a slew of serial killings of children took place and the person committing these crimes was a fourteen year old boy. It is said he not only killed the children but in many cases decapitated them.
The shamo Manga has not been sold since 2007 and this is partially because the artist and creator are in a battle of sorts. The two creators are battling in court over copy write issues and they are fighting over who created what and who came up with the concepts.
You can still find lots of great information for Shamo Manga. Manga drawing is especially popular if you want to learn how to draw in this creative way.