Nene is fed up with cleaning bathrooms, but there's no getting out of her ghostly bargain, so she seeks advice to make her chores fun. Later, the mokke attack Hanako, hoping to take his place as a Wonder. But why?

Even apparitions can get sick, and there's a cold going around. Hanako is laid up with a fever, but he seems... delighted? Then, the youngest Minamoto finds a battered mokke on the street. How will her apparition-hunting family react?

Nene turns into a mokke! Descending into the bowels of the school in search of a cure, she discovers a world-shaking truth. Then, a secret agent infiltrates a nursery supposed to be raising monsters. But what are the researchers really after?