Koutetsujou no Kabaneri Movie 1: Tsudou Hikari

Definition

During an era of rapid industrial growth, humanity is beset by the emergence of a mysterious virus, capable of turning humans into mindless creatures called "Kabane." With a desire for nothing but human flesh, these undead beings can only be killed by destroying their hearts—which are encased in a cage of unyielding iron.

Sources

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