The big clock that governs Kamome Academy’s time is destroyed―a sin that the Clock Keepers won’t easily forgive. When Akane is called upon to fulfill his duty, he sheds his identity as Vice President of the student council and steps into the role of the lowliest Clock Keeper―the guardian of the present. With Kako and Mirai at his side, a trial is to be held in the Clock Keepers’ boundary. Who is guilty? How shall they be punished? And…what must the Clock Keepers do to set things right?