Detective Conan S01 E692 The Night Cherry Blossom Route on Sumida River (1)

"One truth prevails."

Kogoro assists the police delivering ransom money to the Nihonbashi Post Office. When arriving at the post office, Kogoro is given a briefcase with further instructions. After Kogoro falls off a boat and gets sick, Conan and Ran begin investigating, but soon...they stumble upon a body!