Yuka is assigned to work at Hanayuya, an inn in her grandfather's hometown of Ginzan Onsen, Yamagata Prefecture. What awaited her at the Taisho-romantic inn were palm-sized demons. To Yuka's surprise, Keishiro, an employee and messenger of God, tells her the shocking truth. According to Keishiro, the inn has been serving ayakashi for generations. Yuka is also told that she is a descendant of an "ayakashi messenger" and is asked to become the inn's young proprietress...?