Yuuki Reiko, member of the Occult Club, barges into the Sket-dan's room holding a picture of one of Kaimei Academy's seven mysteries, the "Ghost of the Incinerator". The Sket-dan are on the case (mainly Switch), trying to find out the truth behind the picture, and getting Shimada Takako from the Newspaper Club mixed up in it, too...
Two-week suspension from 
extra-curricular activities!
¡Dos semanas de suspensión en 
actividades extra-curriculares!
¡Dos semanas de expulsión de tus 
actividades extra-curriculares!
Suspensão de duas semanas das
 atividades extracurriculares!