I'll comment something I haven't seen someone else mention, is there an explanation for the scar on Kaguya's legs? I know she isn't wearing pants and the lines are consistently there.
It's weird how Kazuya can land these women who are worshipped like Goddesses, in the side story Mami is also treated like some kind of Goddess pretty regularly. And Mami was his *actual* girlfriend, maybe they see something we don't? Maybe he's just the protag.