If you already watched the anime, do not watch this.
This episode simply is meant to hype what at the time was the upcoming season, nothing more. And it does a good job of that, if you had previously read the manga. For those just getting into this, it might not make much sense. This essentially just spoils what are some very funny scenes and also actual plot.
The animation style of this is actually also a bit different than the anime.
It's pretty solid as a summary, but honestly it is not worth your time.
