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220 pages, Paperback
First published May 15, 2002
“I’ve already decided that Q Class is only consisted of five people. If one person goes up, someone is going to go down.”
“There’s no doubt about it. There really was a thief who entered here!”
“We will have a reasoning match between the top 5 members of A-Class and the top 5 members of Q-Class.”
“My bad habit is directly asking for other people’s help when I was being pressed… If I become a detective that means there’s a probability I will have to face a case all by myself and I have to solve the clues all by myself too.”