Library Cross: Toki ga Kitara, Kono Negai wo (2018)

Produced by otome game label Otomate, LibraryCross is a crazily huge crossover between many of the developer's works, including Amnesia, Hakuoki, Norn9, Beast and Princess, Welcome to Fukujuro, and Yunohana SpRINGI. Featuring nine original characters, the heroine is a medical student who finds herself locked up in a mysterious place upon waking up. Having only a strange white book and a clock, she will have to choose between following the instructions in the book to escape, or to die in that room once the clock hits 13:00.

Storyline

You have all been chosen to complete this book. In order to do so, you must defeat ayakashi. If the book is not completed, all of you will die. You have until…1pm. You awake in a world you’ve never seen before. When you look up, you notice a huge clock with 13 hours marked on it. Lying next to you is a ‘white book’ that is familiar to you. You find 9 young men trapped in the same library as you. Though you try to escape through a large set of doors at the back of the room, it has been firmly locked. To escape from this world, you have no choice but to follow the orders of a mysterious book...