Kogoro is hired by Morooka, a wealthy man who claims to have received a threatening letter, and comes to the Black Rabbit Restaurant with Conan, Ran, and Amuro to meet his client. When Morooka and his butler Fukamachi arrive, Kogoro checks the threatening letter, which states, "If you want to live, stay away from the Black Rabbit Restaurant." Morooka and his party are entertained by bunny girl Yuri, while bunny girl Sana looks on angrily as it seems Yuri will be the top earner tonight. Later, Yuri takes a sip of her drink and suddenly begins choking...

Someone poisons Black Rabbit Restaurant employee Yuri's drink with arsenic. The suspects are narrowed down to Morooka,, Fukamachi, and Sana. Conan and Amuro determine the truth based on Yuri's fake nail discovered by Ran and a casual comment from Kogoro. Conan interrupts Megure as he's questioning the suspects, telling him two of them couldn't have been the cuprit based on their words and actions, and gradually closes in on the culprit as he reveals the trick they used. After the case is resolved, Amuro uses a spare key to break into the Kudo family residence. Amuro and Okiya Subaru, both armed with guns, end up face to face..