Ivy sombra is the daughter of the ruler of the Shadow Fox Demon clan. Then her mother tell her that she has a human little sister that could be orphaned.
Ivy is 19 years old and since she goes by her human years she thinks she grown but her mother objects saying that her demon blood is more dominant so she's still too young to travel and look for her lost little sister. Later she convinces her mother that she can take care of herself and go out into the world.

Bad summary but good story hope you like.
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