Natsume's Book of Friends

The Swallow at the Water Bottom (1x6)

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Natsume gets possessed by a swallow spirit, who wishes to meet a human that helped her before. 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 of he hears of a kimono that can turn a spirit human for a day, he strives to find it...