The Fox King

Zhe Huo, a professional huntress of demons, comes across a little boy in the wilds one day... who also happens to be a fox demon. Adopting the child temporarily, she discovers that he's not only well-behaved, mature, and adorable, but also unbelievably capable at all manner of tasks. Amid all sorts of strange occurrences, as well as deep suspicion from everyone else who encounters him... Is there something amiss about this boy that she should be worried about?