People who compare this woth Usagi Drop are just dumb, and i'm not sorry for saying this.
In Usagi Drop, the 2 main characters :
-are from the same family
-have a 30 y age difference
-Are humans (obviously)
-feeling from the girl changed at the middle of the story abruptely.
Here, both mc :
-Are NOT from the same family
-they're not even the same race, he is human, she is a demon.
-have 10 y old age difference. I dont know where you find 10y old fathers on earth. The most he could be was a big brother.
-but that never happen, because she never see him as someone pn yhe same family, she already had a real father and mother who died and she see Him as a man since chapter 1.