Well I finished the anime series a couple of years ago, but I can't quite remember if they are scheduled for more of those OVA later. I doubt it since it has been a little bit of time, but either or, I enjoyed the series.
It is my kind of series. I enjoy most titles that involve a paralell universe or a seperate one. The characters weren't overly fascinating to me, escpecially the main protagonists, but I did certainly enjoy the various antagonists. Character development wasn't miraculous in that sense of "overnight powerups" and it progressed well throughout the series. I can't say a whole lot considering details aren't quite my thing, but most of the series appeared to run fairly smooth with little to no fillers. It is not necesarrily ongoing from my knowledge, but there aren't a lot of boing arcs and plot progression seemed to be moving at a reasonable pace.
The manga is still ongoing but the last few chapters I have seen are in such condition I can't even acknowledge as a continuation. So much for translators.