The Hell's Clock is a special item possessed by a ghost who is said to appear when the school's clock rings if someone is in need or calls for her. Several of them are shown existing, and the Ghost always returns to collect them once the owner finishes using it.
Rui and Kei Mizuhara are shown possessing them during Period 34 and Period 35.
Appearance[]
The Hell's Clock is a plain looking pocketwatch on a long beaded chain.
Usage[]
The Hell's Clock is used to move forward or backwards in time. The length is decided by the user of it, but if one obtains the clock, they must sacrifice something precious in return.