It is literally translated as "My Wife is a Magical Girl."
I opened bewitched_agnes, a community for it, where I have also uploaded all 13 episodes fansubbed to Megaupload here.
It is a magical girl series, and is a little ecchi, so I would say it could be rated around PG13.
Here is a short summary I wrote:
Okusama wa Mahou Shoujo is a cute anime about Asaba Ureshiko who is actually a magical girl called Agnes Belle. (Hence the name of this community.) Agnes is getting too old to be a magical girl. The next magical girl who is supposed to take of the town Agnes loves is Sayaka, a.k.a. Cruje. Agnes wants to protect the town and the magical girl in her, but time is running out!
I am very bad at writing summaries. xD;;
One of my favorite things about this series is that Inoue Kikoku does the voice of Ureshiko, and also sings the ED theme "jewerly." (In my opinion, the OP theme "Home & Away" isn't as good.)
Also, Shimizu Ai does the voice of Sayaka (Cruje) and does a very good job. :DD
This fandom is absolutely minute. xD; So if you're looking for something cute and short to watch, give Okusama wa Mahou Shoujo a try. ;D