Mare no Bakekitsune

Mare, an abandoned child, was picked up by a fox spirit, Nibi, and they started living together. As a youkai who dislikes humans, Nibi is worried about Mare going out on the town, so he gets overprotective. As she grows into adolescence, she becomes more rebellious and over-sensitive. A Japanese-style fantasy romance about two people who love each other even though they clash!

(Source: Hakusensha, translated)