Relaxing is perfectly fine, the main selling point to me is the atmosphere. ( super subjective, I know)
Koe no Katachi, huh? Heard a lot of great things about it, am actually holding it off because I've also heard it's gut-wrenching.
Then it should suit you fine, if you don't mind the somewhat slow pacing.
Koe no Katachi is indeed very emotional but if you can get past the suffering the heartrending moments are pretty satisfying. It's apparently ending soon so you could always pick it up when it's concluded.