Hanako-kun of the Bathroom Aoi informs Nene about a new apparition called the Three Clock Keepers who control time. One keeper controls the past, one controls the present, and the third controls the future. Nene enlists Kou and Hanako to help deal with the clock keepers after a number of time related disasters occur in the school, this includes a classroom and several students being aged up. At first the trio are stuck with no leads but Hanako suspects that Aoi might be linked to the clock keepers as she was not aged up or affected by their magic...