It's definitely not for the faint of heart as it contains very graphic (though censored) scenes of rape, sex, and sodomy. The mature content aside, the story is compelling and has good character development (although compressed to due to time constraints).
If you want hardcore BL/yaoi, Enzai doesn't disappoint (believe me). The story is also enjoyable.
This OVA only does well as a supplement to the game (as it is based on the game's "good" ending and as such can be seen as a spoiler of sorts).
