Koutetsujou no Kabaneri

The story takes place in a chaotic world where humans struggle to survive against a growing threat: the Kabane. These beings, whose hearts are made of steel, devour every human they encounter. To protect themselves from this threat, populations have taken refuge in immense fortresses called stations, which are connected by armored trains, the Hayajiro. Ikoma, who once fled from the Kabane, now lives in one of these fortresses. But now, he is firmly determined to fight for survival.