Natsume is implored to help spirits who are currently being exorcised. He finds a kindred spirit in Tanuma, a boy who also senses spirits although not as powerful as Natsume.

Natsume is possessed by a swallow spirit, who wishes to meet a human who once helped her. Natsume agrees to help her and the two grow attached. When Swallow finds the human, Natsume feels bad that she can't actually meet him, but when he hears of a kimono that can turn a spirit into a human for a day, he looks for it.