Soooo, first and foremost, if you haven't heard by now, this "OVA" is hardly that. It feels much more like a visual novel if anything. There's hardly any actual animation; the entire thing is mostly just a bunch of still images being shown in a slideshow. That doesn't automatically make it bad though. They actually gathered quite a few of the original voice actors to perform for this OVA, but not all of them. (I'd like to note that I found it really funny whenever Nunnally came across a character who never says anything, probably because the voice actor didn't want to have anything to do with this OVA). The production costs look so very poor, it makes me wonder just how little money they spent to make this. Especially later in the OVA one can tell as it shows one of the most hilarious fight scenes I've ever seen. I'm willing to say this OVA is worth watching just to see how funny that fight is!
To be fair, the plot isn't bad at all. I mean, it's pretty much exactly what one would expect from the title 'Nunnally in Wonderland.' Of course, if you've never seen Alice in Wonderland or heard the story, you probably shouldn't watch this. OVAs are never really about anything substantial anyways, so I liked it, and you should too.
All the BGM is just recycled from the two seasons, so don't expect anything new there.
The real 'fun' one can have while watching this is trying to guess which character will be which one from Alice in Wonderland. Just about every single Code Geass character appears at some point in this OVA, so make your guesses before starting!
Overall, I enjoyed this OVA. If you liked Code Geass, I can't guarantee you'll like it as well, but give it a shot. It's only thirty minutes long anyways.
