1. This is an anime, but it sure as heck breaks anime stereotypes. It's absolutely nothing like one, except for the good character development, animation style, and storyline
2. This anime is EXTREMELY explicit, and there is very explicit, gory, and mature scenes. I recommend not watching this if you are under 18, or if you can't handle mature images (Ex: WARNING, THIS IS A VERY GORY IMAGE. {Not every scene is this gory} [The picture is very large when it opens up https://i.ytimg.com/vi/Ku1f4QGnXnY/maxresdefault.jpg)
3. It's about 7 guys in Japanese prison in the 1950s
4. There is cursing (a fair amount to a lot of it), if you're worried about that
5. For those of you who can't handle remembering Japanese names, every main protagonist has a nickname (Mario, Turtle, Uncovered, Cabbage, Soldier, Joe, and Bro)

I've watched 7 episodes, and this is a great show so far.
http://myanimelist.net/anime/6114/Ra...u_no_Shichinin