It's a secluded hot spring that treats and heals youkai...!? Yuka has ended up working at Hanayuya, an inn in Ginzan Onsen, Yamagata Prefecture, her grandfather's hometown. Waiting for her at this inn, filled with Taisho-era romance, are palm-sized little demons. Keishiro, an employee of the hot springs and a messenger of God, tells the surprised Yuka a shocking truth. He tells her that this is an inn where generations of owners have treated ayakashi, and that Yuka is a descendant of the owner, an "ayakashi user." Yuka is surprised, but he asks her to become the young proprietress of the inn...!?