An enigmatic young woman joins the train, Hayajiro Koutetsujou, and arrives at Aragane Station. She is known as Mumei in Japanese which means "No Name" or "Nameless," a name bestowed upon her by her sibling.
She is revealed to be a Kabaneri as well as a very strong and agile fighter, capable of killing dozens of Kabane with ease.Before Biba gave her the name Mumei, she was known as Hozumi, in which Ikoma guessed the Kanji as "穂積." She didnt become Kabaneri from getting bitten by Kabane, but volunteered to be one under Bibas experiment.