Keiichi was a high school loser... until one day a strange woman came through the mirror in his room! Unable to stay in student housing after the Goddess Belldandy granted his wish for her to be his girlfriend, Keiichi and Belldandy come upon the possession of an old temple, where the pair live together... alone... at least until Belldandy's sisters, Urd and Skuld, join them.
Yeah, I just copied and pasted the summary from the series countdown. I'm sure no one really noticed, but that's okay, because really, both that series and this OVA really tell exactly the same story. This OVA manages to take what must have been a lot of material and condensed it down into a well-constructed, entertaining 5-episode series. The characters weren't introduced very well, but eh, their personalities were such that not much was needed. And the main conflict of the series didn't arrive until the final episode, but it was still really nicely done and didn't feel rushed or anything.
There ya have it. Thanks for watching!