This site has pretty extensive reviews on Enzai and pretty much all things yaoi related.
There's two parts to it, and very dark. It's pretty much just abuse of the main character.
It's based on a game which has been released in the US by JAST with english text. It's funny how they've changed his age to the legal 18 even though he's obviously younger. Makes sense though, otherwise they wouldn't be able to release it here.