Just watch the beginning, stop when they start talking about glasses, then resume after minute 17. All that it's in between is boring filler. You basically have 5 minutes of anime canon, about 15 minutes of filler and the rest is opening, ending and preview. Worse than Dragon Ball.
You know what filler is good for? Showing the powers that the cast have more than just the moments you get in the Manga, and sometimes in ways that differ from the source material. or Touch on and foreshadow something that you'll only notice later and not now.
this anime is now in anime canon not manga canon and not filler currently it has almost nothing to do with the current manga story but it still is connected in a way no need to make a fuss about it just go into a filler list site that shows you when the manga material comes back :) (it wont in a while since the manga needs to go a bit further)