Detective Conan Episode — 7

Depending on what you are looking for, "useful piece" might also refer to:

Beyond the specific case, this episode is a major milestone for the series' main plot: Detective Conan Episode 7

: By checking hospital records, Conan discovers Tomoya was a patient who died three years ago on February 19th. This allows him to deduce that the sender is seeking revenge on the exact anniversary of the child's death. 🔍 A "Useful Piece" of Plot Development Depending on what you are looking for, "useful

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 🧩 The "Key Piece" of the Case :

: Conan notices a saved game file under the name "Ogino Tomoya" .

💡 : Fans often discuss this episode because of Conan's noticeably "chubbier" animation style, which was unique to the early production designs.