When Tomoe collapses and the Mikage Shrine begins to fall apart, Nanami Momozono learns that a curse laid centuries ago is killing him. Refusing to let him die, she travels five hundred years into the past to stop Tomoe from cursing himself, only to be mistaken for a yokai by frightened villagers and rescued by Yukiji, the human woman Tomoe once loved. This four-part OVA adapts the manga's Past Arc, set before the main series.