Our story starts when a girl finds herself summoned by an Onmiyouji who claims that she is his shikigami “created” to do his bidding. The girl has no recollection of who she is but she feels like she was a human and her name is Sayuki. Sadly her new master, Abeno Seimei, is pretty demanding and tells her that if she doesn’t accept her fate as a shikigami, she will disappear. Seimei then brings her to Izumi at the capital to work, to do things like console quarraling married couples or deliver love letters. Unfortunately some of the jobs she has to do also require her to fight demons. Will she be able to get used to her new life as Shikigami #3?