Hollow Mystery: Conan and the Stringmaster's Crossover Alliance

When the Hollows of Zenless Zone Zero and the factions spawned by them shatter the peace of the Detective Conan world, Conan, Ran, the Junior Detective League, and others accidentally fall into a Hollow. Fortunately, they receive help and guidance from Zenless Zone Zero's proxies, Wise and Belle. Meanwhile, an industry centered around the Hollows springs up among ordinary people. While investigating the Black Organization, Conan must also deal with bizarre cases connected to the Hollows. Wise and Belle cross worlds as well, helping Conan solve mysteries. From Tokyo to New Eridu, deduction and combat intertwine as multiple factions vie for power. An adventure that will determine the fate of two worlds begins here. [The early chapters might not be very good, so please don't bash it.]