The world is overrun with Kabane, infected humans with an appetite for flesh. While the last of humanity has retreated into fortress like stations connected by armoured trains, some remain as hopeful as Ikoma. Servicing the trains for a living, Ikoma uses his spare time to build a weapon that could defeat the Kabane. Unapologetically optimistic, he eagerly awaits the day when he can test it. When a train is hijacked by the Kabane, he may finally get his chance. But an unexpected turn of events puts, him in a situation that will test not only his weapon but his own humanity.