It has been three days that Shinichi has been shrunk and stays at Ran's place. Conan then goes to school, where he meets three of his classmates, Ayumi, Genta and Mitsuhiko that wants to be friends with him. After school, Conan visits Professor Agasa, which give him a new gadget. On his way to the Detective Agency, he is staring at Kogoro because he was useless for him to find the men in black. A car then stops in front of the agency, and the three classmates of Conan are spying on him. Kogorō later got a customer, but doesn't show any interest unless he noticed it was Yoko Okino which Kogorō changes himself quickly. Yōko tells that she has been staled for three days, which that Kogoro and the others are going to her apartment to figure out who. Ones arrived at her apartment, they see a dead body on the ground with a knife on his back. Later it has been known that it is a murder case, Yōko and her manager Yamagishi where both suspects on the murder case, which later a third suspect has been added, Yōko's rival Yūko Ikezawa. The case later has been closed, containing that it was suicide and the dead person contains to be Yōko's ex-boyfriend Akiyoshi Fujie.

JP: アイドル密室殺人事件 (Idol Misshitsu Satsujin Jiken)
EN: An Idol's Locked Room Murder Case (a.k.a. Beware of Idols)

Conan runs into the black-clothed men from the pilot episode while riding the Shinkansen. He investigates further and realizes they only resemble the original two men. Using his gadget glasses and a bug, Conan overhears their conversation about a bomb in a black suitcase on board the train and is set to explode soon. Conan narrows the suspects down to four. Conan realizes a woman on the cellphone mentioned she liked viewing the mountains but her seat was facing the sea. He realizes the men's seats were facing the mountains and deduces that she was the one who met them. Conan, armed with his new power kicking shoes invented by Agasa, manages to kick the briefcase off the train before it explodes. The woman and the two men are later arrested.

JP: 新幹線大爆破事件 (Shinkansen Dai Bakuha Jiken)
EN: The Shinkansen's Bomb Case (a.k.a. The Time Bomb Express)