S1E136 : The Old Blue Castle Investigation Case (1)

22 February 1999

25 mins.

The Detective Boys are on a camping trip but Dr. Agasa forgot the tent. They wander to a castle owned by Masuyo Mamiya, meet Katsuo Tabata, Mitsuru Mamiya, Takahito Mamiya, and learn that there's a secret treasure somewhere inside.

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