Case Closed: The Stranger in 10 Years...

Meitantei Conan: 10 Nengo no Stranger

This OVA takes place ten years in the future and chronicles the possible events if Conan Edogawa and Ai Haibara do not take the antidote to APTX 4869 and grow up alongside their friends Genta, Mitsuhiko, and Ayumi, while still maintaining their detective endeavors.