The arc concludes with Conan, Ai, and Professor Agasa attempting to recover data on the APTX 4869 from a floppy disk, only for the "Night Baron" virus to delete everything before they can read it. Case 2: The Old Blue Castle Investigation
A new girl named Ai Haibara joins Conan's class. She eventually reveals her true identity as Shiho Miyano (codenamed Sherry ), the scientist who created the APTX 4869 poison that shrunk Shinichi.
The Junior Detective League helps a classmate find his missing brother, leading them into a dangerous counterfeiting ring that Conan initially suspects is linked to the Black Organization. Stai guardando DetectiveConan Ep 136-139 ITA
In the international (Italian) numbering, often refer to the massive 2-hour special originally aired in Japan as Episode 129. This is one of the most important arcs in the entire series because it introduces Ai Haibara .
Conan disappears early in the episode after finding a secret passage, leaving Ai Haibara and the other children to solve the mystery of the castle's hidden treasure and a series of disappearances. The arc concludes with Conan, Ai, and Professor
Dr. Agasa takes the Junior Detective League camping, but they get lost and seek shelter in a massive, eerie blue castle.
If you are following the Japanese numbering (which some Italian streaming platforms or fan-lists use), cover a fan-favorite "survival" mystery. The Junior Detective League helps a classmate find
This case is famous for its creepy, suspenseful vibe and for showing Haibara’s impressive detective skills while Conan is "out of commission".