I had to finally leave a comment on MAL to counter some disinformation. You don't need to be a fan of SMT to enjoy this, and it is actually a very unique and fun OVA. It's full of atmosphere and many of the visuals are powerful and carry a lot of weight to them. The confusing elements of the plot just leads to it feeling more abstract, which allows it to get away with any 'inconsistencies' that other viewers might locate. Highly recommended for fans of 80s horror OVA. This certainly has an interesting feeling to it, and while I understand that fans of SMT mightfind this to be an unsuitable adaptation of a universe that they are already familiar with, I believe that a casual viewer will still find a lot to enjoy.