The Most Useful School in the World Case (Part 1) Meitantei Conan : Season 20 Episode 31

Kogoro is asked to be a star in an educational television program. Once there, he is introduced to guest stars and studio members. Noburo Kimijima, the leading figure of Enka, has his priceless vase stolen during rehearsal. They deduce the culprit is still inside the studio room.