Kabane

The Kabane (カバネ, lit. corpse) are zombie-like humanoids that infects humans with the "Kabane" virus. Kabane are grey and have red lines across their bodies. The Kabane have strengthened bones cages around their heart that are highly resistant to conventional weaponry. It cannot be defeated unless its heart, which is further protected by a layer of iron, is pierced. They appear to have some degree of intelligence. Examples involve operating the Fusoujou in order to break through the West Gate of Aragane Station, using simple melee weapons, attacking trains at weak spots such as doors and attacking Ikoma through the roof instead of head on through a front door. Kabane also possesses incredible speed enabling them to reach to humans at an astonishing rate however this varies as some Kabane posses a rather large and burly size hindering their speed to a certain extent. Kabane also have extreme physical strength as they are able to make dents and sometimes rip open bolted iron doors from trains.