Hide and Seek Kekeyi

A group of young people visited their old school building to reminisce. When one of them proposes a seance game, Mikasa has a hunch that something bad will happen, so she calls her boyfriend - Eren - to come pick her up. Two hours later, Eren came alone. Her phone calls never go through, and Mikasa's messages have been cut off ever since the girl said that the ceremony has started. Completely not knowing what happened, Eren entered the school, only carrying a flashlight and a raincoat.