Well if you want more from red, lit and ruti you will definitely disappointed, its barely there, maybe you can watch last 2 episode if you really have to.
Instead season 2 just focus on a nutjob antagonist that just really not enjoyable to watch.
Anime season 1 and this manga is pretty much the same, IMO it just the matter of what media you prefer.
Im not recommend season 2 though, either you just pretend the story end here or maybe just read LN.