Zettai Bouei Leviathan: Mini Takibi Gekijou

Personally I found this more enjoyable than the actual show.

Mainly cause in this mini short we see more of the characters personality.
It also pretty much like listening to a radio special with the cast.

The animation is simple, the 4 are always around a campfire, and basically just chat about the episode in which it relates to.

We get some fan service still shorts, of the girls in Maid, Miko, Scale outfits.
And we get to see more of Levi as a character, something I felt was missing in the actual show.

... All in all its about 48 minutes. And to me the banter here was more well written.
And it was also a lot more adorable.