In of Detective Conan (titled "Once-A-Month Present Threat Case"), the "useful piece" likely refers to a specific clue or plot element that Conan uses to solve the mystery or progress the overarching narrative . 🧩 The "Key Piece" of the Case
to stop the culprit in this episode, demonstrating their utility for the first time in a life-or-death situation. Detective Conan Episode 7
Depending on what you are looking for, "useful piece" might also refer to: In of Detective Conan (titled "Once-A-Month Present Threat
: Conan drops his guard and acts exactly like Shinichi, even mimicking Sherlock Holmes' deduction style. This leads Ran to notice the uncanny similarities between the "child" and her missing friend. ⚠️ Potential Mix-ups Detective Conan Episode 7
