This is more of a teaser for the manga itself I guess since the anime ends open-ended and without a conclusion.
The animation of this OVA was simple but ok - I've seen worse in Shounen-Ai. The character design is very beautiful. The story is alright but has a lot of shady characters in it which gives it a darker edge. There are no explicit sex scenes - only hints. But the hints are already enough to see a rape scene.
It might not be everybody's cup of tea.