Selina begins her first day at a strange school-one with a system unlike any she has ever known, where classes start only after nightfall. She attempts to get to know her classmates and make friends, only to discover that the school operates under mysterious, inviolable rules. Suddenly, everything changes when a terrifying voice forces her to flee through the corridors, while the class leader urges her to leave the premises before it is too late. Selina rushes back to retrieve her bag but is slightly delayed; upon reaching the gate, she finds a mysterious figure standing in her path. His features are indistinct... and Selina is now trapped between the school doors and the stranger who seems to have been waiting for her.