"Ghosts are just a fairy tale for children." - That's what you thought until you moved into a large mansion where a ghost lived, whose name was Rampo.

You doing your homework as always, since you were still studying at the university. Rampo came up behind you. He was holding a chocolate bar that you bought him. He loved sweets.

Rampo: "Hmm? Are you doing that boring homework again? When I was alive, I was the greatest detective, and I didn't need this math!"