Not so much an OVA but a promotional video from before the main show was released. Now, as far as a promotional video goes it is pretty good but also terrible.
It is also pretty badly animated. Had I seen this first I probably of hesitated from watching the show so I don't think it really helps it. It does work in the way of what it wants to achieve but also doesn't.
You see a fair few characters on screen but again it's a short that is not designed to develop.
I would honestly say overall that it isn't too bad as a promotional video but the animation choice just really does make me question whether it would have helped people watch the show.
