Can you recommend any manga that could be described as: Group of friends doing various antics, escapades & adventures, preferably set in some fantastical setting like sci-fi or fantasy. If the setting is just our ordinary contemporary world that's not what I'm after.
A little bit of harem going on could be nice too.

I read "Knights of Sidonia" and I particularly liked the part of the manga between the fights/battles, so that is what leads me to looking for other manga.

Thanks