One fateful night, a group of classmates decides to try the Happy Sachiko charm after school—a ritual believed to cement their friendship forever. However, one wrong move plunges them into the eerie remnants of the long-demolished Tenjin Elementary School. To escape this spectral prison, they must overcome the school's sinister secrets by reuniting and performing the charm correctly. But before this horrifying ordeal, these friends led typical lives. Corpse Party: Missing Footage offers a glimpse into the day preceding their descent into a chilling reality.