An educational Meitantei Conan OVA where the Shounen Tantei-dan (Detective Boys/The Junior Detective League) go on a field trip with Ran to learn about the Jomon Period of Japan, which is the earliest historical era of Japan. This OVA was released as a bundle with Shogakukan's Nijuuisseiki Kodomo Hyakka Rekishi-kan (21st Century Children's Encyclopedia History Museum). It uses animated characters on top of live-action backgrounds.
