Soul of the Sword by Julie Kagawa; (Shadow of the Fox #2) 2019. Hardcover. (YA)

One thousand years ago, a wish was made and a sword of rage and lightning was forged. Kamigoroshi. The Godslayer. A weapon powerful enough to seal away the formidable demon Hakaimono. Now he has broken free. Kitsune shapeshifter Yumeko has one task: to take her piece of the ancient and powerful Scroll of a Thousand Prayers to the Steel Feather temple in order to prevent the summoning of the Harbinger of Change, the great Kami Dragon who will grant one wish to whomever holds the scroll. But she has a new enemy now, more dangerous than any she has yet faced. The demon Hakaimono is free at last, and he has possessed the very person Yumeko trusted to protect her from the evil at her heels, Kage Tatsumi of the Shadow Clan. Hakaimono has only one goal: to break the curse of the sword and set himself free to rain chaos and destruction over the land forevermore. To do so, he will need the scroll. And Yumeko is the only one standing in his way.