Each Special is only a handful of minutes long on average about 5 minutes of fanservice goodness. While being topless is good there is still some censorship in regards to the younger girls (it was being released during that time when the possiblity of younger anime girls getting banned was a high priority) and anything more than just showing bare breasts.
There isn't much of a plot to the specials it's just the girls getting a vacation from work at an earth Hot Spring Spa and of course the human cast ends up going to the same place as well. The girls all fight over the dude of course. The elite squad makes out with each other and the Alesta and Plug get caught watching and get smacked around like usual. Basically it's more of the series shenanigans set at the a Hot Springs Spa. Some one mixes in a de-stealthing agent and the girls all suddenly appear out of no-where.
It's a funny good time and a lot more of the same good natured Fight Ippatsu Juuden-chan fanservice sillyness. If the series does get picked up by an american licenser (it hasn't yet) I really do hope they include the specials as well.
I can't find the normal regular trailer for it like I did some time ago but here is a spanish subbed one.
