An actual Ruu arc?! She really needs more development since she didn't really have much in the prequel. IIRC, she already loves him as soon as she started moving because of her mobile game which probably had an affection meter. Ironically, this turned her into needing more chapters for said development.
I'm a big fan of Harvest Moon, Rune Factory, and Stardew Valley, but I really can't get into Animal Crossing, so I understand.