Detective Conan OVA 06: Follow the Vanished Diamond! Conan & Heiji vs. Kid!

What better way to kick off a diamond heist mystery than a misdialed phone number, and honestly, that's a perfect summary of how Detective Conan works. Kogoro Mouri's detective agency gets a misdialed blackmail call, and instead of hanging up, Conan Edogawa recognizes the voice on the other end as someone suspiciously similar to his Osaka rival Heiji Hattori. Next thing you know, the two high school detectives are teaming up to track down a stolen gem. The catch? Kaitou Kid, the most stylish thief in anime, is already after the same diamond. This single-episode OVA captures exactly what makes the Detective Conan universe fun: two genuinely sharp detectives bouncing off each other while a charismatic phantom thief runs circles around everyone. The comedy lands because the characters have real chemistry, and the mystery actually gives you enough to follow along without feeling like you're just watching characters explain things at each other. If you've enjoyed Lupin III's cat-and-mouse energy or the puzzle-box tone of Kindaichi Shounen no Jikenbo, this hits a similar note in about 25 minutes. It also works as a low-commitment intro to the Conan and Kid dynamic if you're curious about Magic Kaito 1412 but want to dip your toe in first. You don't need to know 800+ episodes of Detective Conan to enjoy it; the setup is self-contained and the vibe is light, clever, and moves fast.