Her dad was in the corps, but he got severely injured, and died in his sleep
She has fond childhood memories of him teaching her how to make wisteria items (incense, seals, etc.) and making them
He would make the warding items to sell to other villagers for low prices, then Kitsune when she was old enough, would help him make and sell
Her mom died around 5 years after Kitsune's dad, in a demon attack when Kitsune was out collecting wisteria

She decided to join the corps in honor of her parents