Kōtetsujō. Ikoma and Kurusu enter Kongokaku, drawing the Kabane towards them. Ayame appeals to the humans to stop attacking each other in fear, and entreats them to leave Kongokaku with her people in the Kōtetsujō. With Kurusu's help, Ikoma is able to reach the Mumei Nue. He destroys the hayajiro Kokujou in the process when the Hunters try to drive it into him with his additional powers since taking the black serum. Mumei seems to be unaware of what she's become, recalling memories from the past and imagining herself surrounded by butterflies. Ikoma reaches the Mumei Nue, but is intercepted by Biba who is revealed as a Kabaneri. Biba stabs Ikoma with his sword, but this does not kill him, and as he is about to try again, Ikoma recovers and blasts him with his bolt gun. Mumei appears to understand that Ikoma is near, and she allows him to inject her with the white serum, destroying the Nue and returning her to her previous form. Ayame and her people leave the smouldering city of Kongokaku in the hayajiro Kōtetsujō with Kurusu, Mumei and an injured Ikoma on board. Ikoma starts to recover thanks to a serum secretly given by Biba and the effects of the black serum seem to diminish. As an afterthought, Mumei hands him back his green stone.