These 2 short clips (around 11 minutes in total) take place before Film Z, it seems. The story is about doing fanservice.
See full reviewWarning/A few words before the review: This review is made by someone who dislikes very much ecchi and the fanservice that comes with it. This is just a poor excuse to do some fan service, really, REALLY bordering porn. Of course, if you're into ecchi and into hentai, and you liked the anime, you will like this special. I just don't like that in an anime when I'm trying to watch it for it's story or w/e. On the bright side, I laught at some points, but overall, this is some fanservice episode, with almost no connection to the series more than having the characters of the anime. (It's a special, and a... See full review