A teacher in Watanuki's school gets her hands into a dangerous item from Yūko's shop, the monkey's paw. The teacher's discovery eventually leads to her downfall and of the monkey's paw choking her.
A rain sprite (Ame-warashi) seeks Yūko's help to save a friend of hers. Watanuki & Domeki go to the place directed by Ame-warashi. Watanuki finds a little human girl amongst the Hydrangea.
Yūko decides to show Watanuki what a real Diviner can do. Watanuki learns more about Yūko's powers, while his past is explained. The important butterfly symbolism found throughout the series is also explained.