There is one other consideration about ERASED that is an unfortunate, yet common occurrence with manga-to-anime projects, and that is that the anime is moving much faster and is thus losing some of the more subtle layers of exposition.
For instance, and I think I've mentioned this before, but Kayo is shown to be more of an unpopular outcast in the manga. The alienation from her peers is more pronounced and it was harder for the main character to get close to her. The main character, for his part, spends a lot more time wondering what he should do, where in the anime he seems to have his plan in place immediately.
The differences aren't bad, and there have been manga adaptions that have suffered much worse (looking at you, Yamada and the Seven Witches) but the pace in ERASED is leaving a little bit of content out and I think people can feel that to some degree.
