Due to the rampage of "The Clock Keeper," one of the Seven Wonders of the World, all the students at Kamome Academy have become wizened and old?! To restore peace to the academy, Hanako joins hands with a certain person.
Just when it seemed like the case was being solved somehow, the secret of Hanako's assistant, Nene, was revealed.
What secret will be revealed? The shocking sixth volume of the Seven Mysteries of the Academy!