Amagoushi no Yakata: Portable - Ichiyanagi Nagomu, Saisho no Junan

University student Ichiyanagi Nagomu runs out of petrol and gets lost in the mountains during a storm. He takes shelter at the nearest mansion, where the first thing he finds is a body lying in the rain outside. Before he can react, someone knocks him out from behind. When he wakes, he is surrounded by a troupe of actors in training for a new play — everyone assumes he is the ninth cast member, and no one believes his account of what he saw. Stranded by the storm and his injuries, Nagomu stays put. By nightfall the group discovers a note reading "Revenge." The next morning one of the actors is found dead, the cars have been sabotaged, and a landslide has cut them off. The investigation has become his problem alone.