She then went back to the car, smashed his watch to show 2:15 PM (the time she wanted to fake), took the locket as a trophy, and drove back to the city using a back road. Her alibi was airtight because she had carefully planned the timing—the drive from the mountain to her friend’s house and the supermarket was exactly 90 minutes, which she accounted for by leaving the shrine at 6:00 PM, not 7:30 PM. She had set Keisuke’s car clock forward by 5 hours earlier that morning, so he arrived at the shrine thinking it was 2:15 PM, but it was actually 7:15 PM.
Further down, at the bottom of the cliff, they can see the river rushing over rocks. Police divers are called in. They find the body of Keisuke Sonoda in the river. The cause of death is blunt force trauma to the head, consistent with a fall from the cliff. However, there are also traces of sleeping pills in his stomach. Detective Conan Episode 406
Kogoro, excited by the prospect of a high-paying case, immediately puts on his serious face and invites her in. She then went back to the car, smashed
Initially, it looks like an accident or suicide. But Conan notices the critical contradiction: Keisuke’s watch is broken, showing the time of 2:15 PM, and the date on the watch is the day he disappeared. However, the pathologist later confirms that the time of death was around 8:00 PM that evening. If he fell at 2:15 PM, he couldn’t have died at 8:00 PM. Therefore, the watch was smashed deliberately to mislead investigators. Further down, at the bottom of the cliff,
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.
Kogoro (via Conan) reveals that the locket is the key piece of evidence. It is not at the crime scene, and when the police search Yukie’s house, they will find it hidden in her jewelry box. Inside, besides Miyuki’s photo, there will be Keisuke’s fingerprints and, more importantly, traces of the sleeping pills from his system that transferred onto the locket when she removed it from his neck.
However, the locket Keisuke always wore did not contain a picture of a childhood sweetheart—it contained a picture of , the girl he killed. He wore it as a constant reminder of his guilt, a promise to himself to never forget the life he took and to live honorably.