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

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

: In the live-action drama version of Episode 7, the critical clue is a pearl from a victim's necklace that fell into the culprit's pants hem. New Gadget : Conan uses Power-Enhancing Kick Shoes Go to product viewer dialog for this item. : By checking hospital records, Conan discovers Tomoya

to stop the culprit in this episode, demonstrating their utility for the first time in a life-or-death situation. New Gadget : Conan uses Power-Enhancing Kick Shoes

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