A Stalker's Murder Case

Situation
The episode starts with Ran, Conan and Kogoro going on a hiking trip. While walking, Kogoro noticed a vending machine and decided to buy a bottle of "Guts-man" as he was suffering from a lack of sleep. He found an extra "Guts-man" bottle in the machine and decided to take it. After careful examination of the bottle, he decided to drink it. While he was drinking the extra bottle of "Guts-man" a scream was heard.

Resolution
« Hide spoilersMiho Nishitani used a poisoned Gutsman drink to kill Tatsuya Nagai; he had pushed her down a set of stairs in public after she called the cops on him for stalking her. Worrying for her life, she knew a stalker would even want to drink what she did, purchasing a Gutsman drink in advance and putting poison in it. She did purchase another bottle from the machine, but pretended to get it, taking out the poisoned bottle instead and pretending to drink it. She left it behind on a fence for Tatsuya to drink. However, two things were wrong with the plan: a sticker on the bottle containing the poison advertised a contest that was already over, and the machine would not likely still have any left. Secondly, Kogoro found the bottle she actualy paid for, but mistook it for a machine error of getting a second one free. However, as evidence in Miho's favor, a bag containing harmful tools was found by Conan in the bushes outside her home; Tatsuya had been planning on killing her. Due to this evidence, Miho will likely receive a light sentence for murdering in self-defense.

Trivia

 * This episodes features the first use of the show's fifth post-credits stinger image, featuring Ran and Conan rushing toward the foreground, with a grim-looking Shinichi in the background.