When gym class is canceled due to bad weather, the students take turns telling ghost stories. To Saya's surprise, the story her teacher tells may hold a secret to her past and the mysterious covenant between humans and Elder Bairns.

Saddened by the deaths of Nono and Nene, Saya struggles with remembering who she made her promise to protect those in the town she loves. Another Elder Bairn attacks the town and Saya is discovered.