Kogoro's Great Pursuit of Anger (1) Meitantei Conan : Season 1 Episode 818

Ran attends a concert of Risa Purple, a rising idol. Kogoro is also acting as her bodyguard. However, before the performance can start, Ran is mistaken for Risa and is kidnapped. Things take a turn for the worse when the kidnappers find out their mistake and try to bury Ran alive to cover their tracks.