Detective Conan OVA 07: A Challenge from Agasa! Agasa vs. Conan and the Detective Boys

Meitantei Conan: Agasa-sensei no Chousenjou! Agasa vs Conan & Shounen Tanteidan

Professor Agasa is kidnapped and the Detective Boys must use clues found at his house and in various parts of the city in order to find him.