The OP and ED of this series had quite nice melodies. And the percussion only tracks are always somehow fitting to the scenes.

Anyway, the ever reliable Anonymous released the ova:

OVA - Anonymous

It was rather interesting and much better than ovas of some other series. Although that's not taking much considering series like this don't have such a solid story and thus it's easy to introduce extra eps that still seem to fit. But nevertheless, it was decent. And the traditional ova fanservice was very mild indeed, which is probably a good thing considering what manner of a series this is.