Biba Amatori is introduced to Ayame, and reveals that he is Mumei's 'older brother' in name only and has been disowned by the shōgun. The Kabane attack Shitori Station and Biba takes his Hunter squad and destroys them all, and kills a re-emerged Enoku, who he accuses of betrayal. He then offers to accompany Ayane's Kōtetsujō to Kongokaku and she accepts. Ikoma suspects that Biba turned Mumei into a Kabaneri and gave her the name Mumei for his own purposes. Biba asks Mumei to get the Kōtetsujō master key for him, but she is tricked and given the wrong key. Ikoma discovers that Biba is transporting Kabane on his train, but Biba uses Mumei to prevent him from entering the carriage. Ikoma is convinced that Biba is not a hero.