Detective Conan movie series!

While investigating the case in which a body was found in a Hakodate warehouse,
What floats to the surface is a Japanese-American man who is secretly working as an arms dealer.

He was looking for a treasure that was said to be hidden somewhere in Hakodate during the war.


Kid borrows Conan and Heiji's brains to solve the mystery of the code that reveals where the treasure is?!
Meanwhile, behind the scenes, Fukushiro Ryōe, who has been guarding the sword for generations, is kidnapped.

Conan and Heiji investigate the meaning of the mark left in Ryou's room and track down the treasure... and what is Heiji's 'plan'?!