I'll keep this review short as Masou Gakuen HxH specials are max 5 minutes per episode. I will tell you what these shorts are about following with my episode ranking list in the end with some of my input. Also, this review will be less serious, because I don't think I really have to be serious when it comes to these types of shorts.
It is fanservice, nudity, lewd stuff, so if you don't like this kind of stuff, then you won't probably enjoy this.
1st episode is Aine's dream with some creative use of tube rubbing against her intimate parts.
2nd episode is Ataraxia's commercial with
Yurishia. She's trying sexy suits with help of some tools to enhance her sexappeal. Very creative commercial.
3rd episode is Himekawa's episode. In this episode you will learn how to plug a kitty. I don't mind this stuff, but you should watch at your own discretion.
4th episode is Reiri's time. It's sexy bunny time.
5th episode is Silvia's episode. If you dislike (or have problem) children or lolis being in lewd position or doing lewd things, then you should avoid this episode.
6th episode is massive harem time. Lots of tittties all around. Basically all characters from the show are there and all of them are naked.
And now it's time for the ranking from worst to best:
6, Episode Nr.5 - Silvia is cute and all, but I don't want FBI knocking on my door any time soon.
5, Episode Nr.1 - Aine's mind is quite perverted.
4, Episode Nr.3 - My mind on the other hand is way more perverted than Aine's.
3, Episode Nr.2 - Very creative, I liked this episode creativity.
2. Episode Nr.6 - If you love boobs, then this episode is a must watch.
1, Episode Nr.4 - What to say, black haired women are my weakness, combine it with something sexy like bunny suit and you have a winner.
Final rating is 7/10. Some nice fanservice, but I would have preferred at least 10 minutes length, because 5 minute or less shorts always seems a bit cheap to me.