Tokeijikake no Ley Line: Kagerou ni Samayou Majo

Michiru enrolled at a boarding school deep in the mountains, distinguished by its unusually large clock tower. On his first day, during an unrelated incident, he accidentally destroyed an expensive statue. As compensation, the school principal assigned Michiru and the boy who started the incident to the Bureau for the Investigation of Special Affairs—headquartered in the underground library. The girl waiting for them there explained the situation plainly: the school has two versions of itself, a daytime world and a Realm of Night that appears when the clock tower chimes. The Bureau investigates what the Realm of Night brings with it—primarily dangerous magical artifacts called Mists. A mystery visual novel built around the strange duality of a school that becomes something else after dark.