A mysterious and anonymous girl whom later reveals herself to be a Kabaneri. She is the adoptive younger sister of Biba Amatori , leader of the Hunters. Upon visiting Aragane Station , she meets Ikoma , a fellow Kabaneri and the two board the Koutetsujou where they proved their allegiance towards Princess Ayame Yomogawa and began their journey towards Kongoukaku. Mumei is a girl with short brown hair and reddish-brown eyes. She wears an indigo ribbon tied tightly around her neck, which suppresses the Kabane virus. Removing the ribbon enables her to access her Kabaneri abilities fully. Her back is home to a large scar.
Kabaneri are neither fully human nor Kabane , but rather individuals with Kabane bodies who have managed to save their minds from entering a Kabane-state by preventing the virus from entering the brain, usually using an asphyxiating restraint. Mumei and Ikoma both possess restraints around their necks. Additionally, due to their Kabane bodies, they require blood as nourishment and are still at risk of succumbing to the virus without having a restraint on or not receiving enough blood to drink.
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