Ep. 10: The Beautiful Boy Genius Exposing the Perfect Mystery Room
Aired on June 17, 2003

10
After two Class A members are killed, Megu suspects an outsider, but Dan argues the killer is among them. Ryu solves the locked room mystery while Kyu notes suspiciously clean shoe prints. Shiramine reveals Gouda is missing and leads the group to Dan. They witness a bloody arm retreat through a fifth-floor window. Leaving Megu, Yukihira, and Maki behind, the others pursue muddy footprints to a room where Gouda’s mutilated body is found. Initially despairing, Kyu recalls his detective ambitions, restoring the group's resolve to solve the murders with Ryu.
Episodes
- Ep. 6 · The group investigates a murder with an actress suspect despite her thousand witnesses.
- 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.