Toilet-Bound Hanako-kun S02E01 - Hanako-kun of the Bathroom

Sudden, rapid aging wreaks havoc in Nene's and Kou's school lives. Hanako identifies the culprit as a fellow Wonder: the three Clock Keepers, rumored to control time at Kamome Academy. The trio set out to punish the offending apparition, but they'll have to find them first.