In terms of comparing it against the main season, it is actually a very good OVA. The show leaves questions unanswered but not in a way that you need to find out.
It is a fun and exciting one with some great scenes that are well thought out.
In terms of the story, it flows really nicely and gets development.
You actually get a nice side of Kinji that is tolerable for this episode which again is nice to see for a change. You see more of the girls being girls and Aria who is just too cute.
As an OVA it does a really great job. If the main season had followed a style like this it would have been so much better.
