Well my opinion on the story it's good.... for a porn game. You can even see that on his discord most people came for the porn but stayed cause the story was interesting. With focus only on the story I don't think it will hold up that much but maybe I am wrong.
I agree. It started out as "Lets fuck some cute nekomata and kitsune,yeah.."
Then.... "Shit, I'm in... it's getting interesting. More, more, more... and not just porn. I love you all."
"Faranne, be nice to me, I didn't do anything wrong."
MGI could probably work without porn,as a romance 3D VN with some light RPG elements. But .. porn is there as a good spice mix...it makes the whole thing taste better and for a while takes away the tension in the story.
Plus it's too late...change everything.