A teenage boy, Takashi Natsume has had the ability to see spirits, but he has...
Natsume's Book of Friends
Season 1 Episode 6: Swallow at the Lake Bottom
Natsume finds a town that had been submerged in water; Natsume gets possessed by a yokai and falls unconscious. Tarusaru informs Natsume about a festival and a Yukata that can turn a spirit into a human for a day.