Kumo Desu Nani Ka?
Google Drive isn't too reliable, Files might get deleted by google themself so... If files are missing, then they are missing :)
So the Anime is... fine I suppose.
the early episode with the 3D was fine but the fights with 3D and the animation is terrible.
Highly suggest you read the Light Novel instead, manga is also fine I suppose.
But for this case I think the LN might be better than the manga.