Natsume's Book of Friends, Vol. 5: Natsume's Book of Friends, cartea 5

Takashi thinks he's found a balance between yokai and friends when he goes with a group of classmates to a country inn for a marathon cram session before school starts again. But even the prosaic threat of homework can't keep the "other world" at bay, especially when the inn keeper has been dabbling in mermaid blood!