Detective Conan: The Pact of Hades

[Enters the world of Detective Conan midway through] What connection does the continent of another world have to Huaxia? And what is the Tong Gu that has waited for so many years? A sea of densely packed skeletons, a flying undead dragon, an undead army armed with guns and cannons: watch as Long Yu unleashes an undead calamity in another world.