Beauty and the beasts has that ending apparently although I think it had more to do with the FL being a clueless indecisive idiot.
And there is
"It Looks Like I’ve Fallen into the World of a Reverse Harem Game" Princess with her own harem and male concubines.
I've read both of them. I meant an ending where everybody gets equal amounts of respect for each other and are aware that they are in a relationship.
Beauty and the beasts doesn't really cut it for me.
"It Looks Like I’ve Fallen into the World of a Reverse Harem Game" = the MC only likes one character and the rest are just there is fill the reverse harem condition.
You are right about the last line.
I don't get why we can't have a polygamous ending. Both Arth and Rebecca are worthy of Sasha and all of them love each other. Naska too.
I wish there was a manga where there is polygamy with both genders (or more).