The special episode was part of the manga so it really isn't a special episode since it was part of the manga.
It was very entertaining to watch. Since the episode focused on the characters in everyday life at their school it was kind of refreshing especially after the amazing battle arc we just saw from before.
Story: 6
This is just based on the special episode
Animation: 6
The animation was okay at the time and it wasn't horrible to watch but it could have been better
Music: 10
The music was amazing and it was on point to every part of the episode. The opening and ending was amazing.
I would recommend it since it is part of the show.