There are total of 4 episodes that can be considered as specials. Each episode around 7 min and last one being 10 min long.
This is the comedy part of the series which were not shown in the original tv series. So you should watch this one also. But after finishing the first tv series it will feel a bit odd as these episodes happened before episode 18 by my presumption.
Although it contains a bit fanservice and can be tagged as ecchi but not too much of that so you can say its censored in a proper way.
