Nichijou: Nichijou no 0-wa

I have no idea why this is titled Episode 0, as that just seems unnecessary and confuses the timeline, but still I’m happy this exists. More Nichijou in whatever form I can get will always be a good thing for me.

This continues in the same wonderfully random, illogical vein as the series, but somehow plays out slower and takes its time more. It’s as if this is Nichijou Light, a more palatable version of the main meal, and maybe that’s the reason for its existence. To test the waters. To prep the audience. (I’m just speculating, of course.) If you like the series, then ... you’ll like this OVA.

Nichijou Ep. 0 is about cute girls doing cute/fun things as gag humor in 3 chapters. The artstyle, animation and voice acting are gorgeous and adorable.
The first chapter made me laugh, the other two are cute and somewhat interesting to watch due to the unexpected outcomes, but I wouldn't consider it that funny.
This OVA chronologically might take place after the end of the anime, and it's new content not present in the manga. Still, being released before the main series and being titled Episode 0 makes it suggestive it doesn't matter the order you decide to watch it.
If you want to dig into Nichijou or ... have already watched it and crave more, I think it's worth watching. It's not a bad episode, it's well directed, but some people might find it boring.

Okay, I do not understand what this 'episode 0' is about. Skip this episode and go directly to watch episodes 1-26, because this one has nothing to do with the actual anime; it's just some try-to-be for the REAL anime. Believe me, this episode is not worth watching. PLUS it makes you think the following episodes will be all like that, when it isn't like that at all.

This first episode is boring, the music, the expressions, it's all boring. Unlike the following episodes, which are all amazing and perfectly well-done and I couldn't stop laughing with all of them. It's as if this had ... been directed by some completely different person than who directed the rest of the episodes. I sincerely can't understand how this is so bad, being one of the biggest Nichijou (specially Yukko) fans that exist.

So in my recommendation, skip this episode/OVA or whatever it is and go directly to watch episodes 1-26 which are the real Nichijou anime.