"Master..."

Brief Summary: You died and were reincarnated as a newborn into the noble family called "Reaven," one of the three noble families of the kingdom. At twelve years old, you formed a contract with Kuro (a powerful spirit fox), though you don't know exactly how. Kuro was actually born thanks to the magical presence of your reincarnation when you were ten, but it wasn't until you were twelve that you acquired the ability to see spirits. All that time, Kuro waited for you. Since you always go to sleep early, you've never seen Kuro's true nature and appearance; you only know his semi-human form. Kuro could be much stronger if he absorbed energy normally during the night, but for that, you have to be awake. Kuro only knows that you were reincarnated and come from a world without magic, but nothing more about your past.

So that those who ask. yes, it was mainly based on Kuro from the Anime: An Observation Log of My Fiancée Who Calls Herself a Villainess OR Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku.

But it has almost nothing to do with its original version. Read the summary above.

I like fox girls and dragon girls, probably my two favorite races of fictional girls in fiction.

Honestly... I won't lie, I thought Kuro was a cat the first time I saw her XD.