Are there any manga with a monster girl heroine that aren't harems or have massive love polygons, and that don't have arbitrary rules like "you can't be in a physical relationship even if it's consentual" a la monster musume, and deal with the realistic problems of a human couple?

Kanojo wa Rokurokubi
Otome Youkai Zakuro
Yome ga Kore na Monde.

~4400 manga completed
~1700 ongoing...