One day, a group of classmates will perform a charm at night after school—the Happy Sachiko charm. This paper doll ritual is intended to ensure they remain friends forever, but performing it incorrectly will cause them to be dragged into a dilapidated phantom of Tenjin Elementary School, which had been demolished years ago. Trapped until they can reunite and perform the charm correctly, the students must solve the mystery of the haunted school to escape alive. Before that ill-fated event, however, the friends led ordinary lives. Corpse Party: Missing Footage provides insight into the students' lives on the day before they were thrust into a waking nightmare.