^ The popularity part is a no brainer. But it's the way Canno structured the story that is difficult to adapt into an anime. The story is basically a main couple that doesn't even show up in a few of the volumes (correct me if I'm wrong: 4 volumes) with a lot of side characters, most of them being side couples, but some being in a side poly trio, and a side group of friends. Try adapting that into an anime, without ignoring at least some of the side characters.
EDIT:
More reasons in favour of me re-reading this (I'm currently having an internal debate on whether to re-read it in the near future).
last edited at Jul 2, 2019 4:29PM