The characters were all made use of in a really nice way, the story was interesting and at times just plain beautiful. The fan service is a little weird but that's it's charm, and I never felt like the fan service was mindless either. The art and sound are the same as the main show so it's hard to review it entirely.
There are a few more "taboo" scenes and moments and if you like that stuff then give this a watch, you won't regret it
Overall it was a nice experience that left me feeling very pleasant.
(7/10)
