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.

It's summer and the gang decides to spend some days in a house by the beach. For some reason Doumeki keeps asking Watanuki to call for his help, but he can't figure out why. Unbeknownst to them, there's a ghost lurking inside. When Watanuki discovers this, will he investigate alone?