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Conan and his friends take a well-deserved break at a video arcade--until one unlucky gamer is found dead in the seat of a virtual-reality game. As Conan and Rachel investigate, they're joined by an unlikely new accomplice: Rachel's English teacher, Ms. Saintemillion. Outside the classroom, the fast-talking American turns out to have an itchy trigger finger--at least when it comes to video games--and a suspiciously keen interest in Conan. Has the shrunken sleuth stumbled upon a valuable new ally...or an enemy agent?

When ace high school detective Jimmy Kudo is fed a mysterious substance by a pair of nefarious men in black--poof! He is physically tranformed into a first grader. Until Jimmy can find a cure for his miniature malady, he takes on the pseudonym Conan Edogawa and continues to solve all the cases that come his way.