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One day, a hayajirō hijacked by the kabane crashes into Aragane Station and they overrun the city. People access the stations and transport wares between them with the help of fortified steam locomotives ( 駿城, hayajirō).
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On the island country Hinomoto ( 日ノ本), people have built fortress-like "stations" to shelter themselves from these creatures. Unfortunately, most melee weapons and the steam-pressure guns used by the bushi ( 武士, "warriors") are not very effective against them. Kabane are aggressive, undead creatures that cannot be defeated unless the glowing golden heart, which is protected by a layer of iron, is pierced, or an important body part is completely severed (such as the head). A mysterious virus appears during the Industrial Revolution that transforms infected humans into Kabane ( かばね, "corpses") and rapidly spreads.
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