Kogoro, excited by the prospect of a high-paying case, immediately puts on his serious face and invites her in.
He explains: Ten years ago, Keisuke Sonoda caused an accident that killed Miyuki, Yukie’s sister. Keisuke was never criminally charged due to a lack of evidence that he was driving, but civilly, he paid a large settlement. He later met Yukie, who apparently did not know his connection to her sister’s death. They married. Detective Conan Episode 406
Conan pieces everything together. He uses his tranquilizer dart on Kogoro and reveals the truth in his "Sleeping Kogoro" voice. Kogoro, excited by the prospect of a high-paying
Conan then looks into the locket. He asks Ran to investigate Yukie’s past. Ran discovers that Yukie had a younger sister named who died in a car accident ten years ago. In the accident, a drunk driver hit their car. The drunk driver? A young, promising architect named Keisuke Sonoda. He later met Yukie, who apparently did not