Case Closed - Season 1 Episode 201

Conan, Ran, and Kogoro are riding a bonnet bus, driven by bus operator Mamoru Kajita and guided by Touko Natsume, through the mountains. On the bus already is the president of the Kagekura youth club, Takurou Yabe. The bus stops to pick up other travelers including Souchiki Okumura, who forces Kogoro out of his seat. He argues with Yabe then drinks from his water bottle and collapses dead from poison.