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...
I had no idea! I mean, who 
could tell a trick like that...
¡No tenía idea! ¿Y quién 
pudo hacer un truco así...?
¡No tenía ni idea! ¿Quién me iba a decir que podía ser un truco así...?
Eu não fazia ideia! Quero dizer, 
quem pensaria num truque desses...