Ep. 11: The Final Deciding Match! The Truth about Q Class!!
Aired on June 24, 2003

11
Kyuu, Megu, and Ryu form one team while Kazuma and Kinta create another. Each group independently discovers clues and develops their own deductions. They subsequently gather everyone to systematically present their explanations, aiming to solve the case and identify the murderer. During this process, Dan discloses the secret regarding the new Q Class. He reveals that these students are not failures, but rather candidates for succeeding Dan in his position at the school. This revelation recontextualizes the status of the Q Class members within the institution's hierarchy.
Episodes
- Ep. 7 · A gifted artist with photographic memory is murdered, leaving a white jigsaw puzzle as a dying message.
- Ep. 8 · The Pretty-Boy Detective Appears at Kirisaki Island to Solve Murders
- Ep. 9 · Kyu uncovers a double-locked-room mystery while the class is trapped by a storm.
- Ep. 10 · The Beautiful Boy Genius Exposing the Perfect Mystery Room
- Ep. 11 · The Final Deciding Match! The Truth about Q Class!!
- Ep. 12 · A Curse Breaks Out!? The Séance Murder Case
- Ep. 13 · Locked Room Evil Spirit: The Unstoppable Murders
- Ep. 14 · Kyuu reveals the forbidden truth about the spirit medium Asakura being the brothers' mother.
- Ep. 15 · Class Q investigates a disappearance during their vacation at an underwater location