Even if you do watch it, it still has a very weak plot. So it has a weak plot, this was probably due to time constraints. The only descent part of the plot is the beginning when everything is just handed to you. From there it just goes on, and on and on. Furthermore, this has got to be the most predictable anime I have ever watched.
Lets look at the characters.
You can not like or relate to any of them. Everyone is so cold and shallow with little or no information about them other then their name. Geist is so one-dimensional and all he wants to do is fight, kill, etc. This OVA has tons of it. Then they start fighting robots.