THanks, of those, I'll check out Orenchi and Superior.

Two additional questions: Does the story of GATE continue after the anime end and if so for how long? Maybe I'll just continue this one.

Also, maybe my inquire for the second type of story was too vague: I'm not looking for romance manga, but manga of WHATEVER non-romance genre that simply feature a relationship between a male hero (or prominent side character) and a monster girl. Preferably some furry girl, not some boring demon/vampire who looks like a human really. And, ofc, still with a serious tone. Imagine "what if there was a Mass Effect-manga" lol.

As for webtoons, I can't read those on my eReader, so manga only pls.-