Koutetsujou no Kabaneri

When terrifying creatures emerge from a mystery virus during the industrial revolution, they rip through human flesh to satisfy their insatiable appetites. These "Kabane" creatures can only be eliminated by severing their steel-coated hearts. But if one of these creatures bites the victim, the outcome is worse than death, as the dead rise once more to join the ranks of the undead. Only the most well-protected civilizations have survived this upheaval, as is the case with the island of Hinomoto, where mankind has built a huge wall to defend itself from the endless hordes of Kabane. It is only possible to enter these massive strongholds by trains that have been extensively armored, which are maintained and constructed by young men like Ikoma. Ikoma is excitedly anticipating the day when he will be able to fight with his new creation, a lethal weapon that he believes can easily pierce through the hearts of Kabane. He has no idea, though, that his opportunity will arrive much sooner than he anticipated.