Doomsday Train: Starting a Slave Trade in the Sakura Kingdom

[Mechanical Upgrades + Beauties + Global Catastrophe + Trains] Su Yang transmigrated into an apocalyptic world, but something about it was off. People had learned of the coming apocalypse in advance and built a global rail network to ensure resources and information could still circulate afterward. Once the global rail network was complete... the real apocalypse never arrived. Instead, humanity began a purge of its own kind ahead of schedule! People with status and special skills took refuge inside the City of the Apocalypse. The wealthy middle class desperately built bunkers and trains, hoping to enjoy a life above the rest during the catastrophe. Just as Su Yang was overcome with despair, a crisp electronic notification rang out: [Mechanical AI xT01 successfully bound.] [You have received your first technological product: Slave Collar!] [Metal collection complete. Train modification in progress...] From then on, with the help of the Mechanical AI, Su Yang took his first step toward establishing himself in this twisted apocalyptic world: the slave trade! A specialty teacher from Sakura Country? Just a hundred kilograms of scrap metal. The lowest-ranking corporate drone from Sakura Country? Fifty kilograms of scrap metal, with one extra thrown in for free!