In a world ravaged by a mysterious pandemic that transforms humans into flesh-hungry monsters known as Kabane, humanity's last survivors huddle within fortified steam-powered stations, isolated and afraid. The story centers on Ikoma, a brilliant young engineer who dreams of building a weapon powerful enough to destroy the Kabane and reclaim the world. When his station is breached, he is bitten but, through a daring self-experiment, manages to halt the infection, becoming a Kabaneri—a being with superhuman strength who retains his human intellect. Alongside the fierce and enigmatic warrior Mumei, who shares his unique condition, Ikoma joins the crew of the iron fortress, a heavily armored train that serves as a mobile sanctuary. Together, they must navigate a perilous landscape teeming with the undead while confronting the deep-seated fear and prejudice of the very people they are sworn to protect. This high-octane anime blends post-apocalyptic survival with steampunk aesthetics, delivering a visceral and action-packed tale of hope and resilience against overwhelming darkness.