Hatsuka Otowa is a priestess and exorcist, and she has just finished a particularly demanding assignment when her phone rings. It is her father, calling from Mizumori Shrine — the family's shrine — with another request. She protests. She has only just returned from the last one, and her older sister Keika could go instead. A deal is eventually reached. At the shrine that sent out the distress call, a young priest explains the situation: youkai have been appearing in the neighborhood, and the weather has been unseasonably cold with snow that does not belong in the season. Hatsuka senses something in the nearby woods and sets out to deal with it.