There really isn't much to say about this one. What we get are six well rendered 3D shorts where we get to see the women of the series playing naked in the bathroom. We get one short scene for each of the girls, with Ritos and Salsa doing the twin thing in their episode. We also get a sixth episode where all six girls play together.
There is no actual story, no dialogue of any kind, this is purely fan service nudity. Of course, it is very well done nudity, and I almost wish that the whole series was done in this
well-polished 3D style. So the actual animation looks amazing, and even though areas are censored (for obvious reasons since it is a Japanese animation), the censorship is well done and does not take away from the actual beauty of the subjects.
In conclusion, if you have watched the series you will probably want to watch these short films at least once. And if you have not watched the series, you still probably want to watch them. A little eye candy never hurt anyone (unless you have a jealous someone who catches you watching it).