Ep. 1: Roller Coaster Murder Case

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Shinichi helps solve a murder on a balcony. After-wards Shinichi goes with his childhood friend, Ran to an amusement park. When someone is decapitated on a roller coaster, they're riding on, he solves the case quickly. As Shinichi and Ran are about to leave, Shinichi follows a suspicious man into an alley he is knocked out and give a poison by a man in black, the poison doesn't kill him but instead shrinks him to the size of a kid. (Source: TheTVDB)