Before he can process this, Sato herself walks in — not in uniform, but in plain clothes. On her left ring finger gleams a modest but unmistakable diamond engagement ring.
Haibara smirks. “And here I thought even the Tokyo police force had lost its sense of romance.” Detective Conan Episode 487
The rumor spreads like wildfire: Sato is engaged to another man. Before he can process this, Sato herself walks
Conan (who happens to be visiting the station with Ran and Kogoro) tags along. The investigation proceeds logically, but Takagi’s mind is elsewhere. He keeps glancing at Sato’s ring, fumbling his notes, and misplacing evidence tags. Sato, for her part, is unusually cold and efficient, refusing to meet his eyes. Midway through the investigation, Sato pulls Takagi aside to examine a piece of evidence—a receipt for a custom ring sizing from a shop in Beika. As they walk, Sato asks quietly: “And here I thought even the Tokyo police
“Do you know why I became a police officer?”
Takagi, red-faced and stammering, doesn’t say a word. Instead, he takes the ring from her palm, examines it briefly, and then—with more courage than he’s ever shown—slides it onto his own pinky finger.
“I take it off when I find the right person,” she says softly, still not looking at Takagi. “But I haven’t found him yet.” Conan, having solved the murder, uses his voice changer (as Kogoro) to guide the police to the truth. The killer is the ex-wife, who removed the engagement ring from the victim’s finger to frame the fiancée. The evidence is airtight: a micro-scratch on the victim’s knuckle matching the killer’s broken nail.