Chikane and Himeko share the same birthday and it's rapidly approaching. On the day of their birthday, the Orochi are awakened and at first Sōma attacks Himeko who is the Solar Priestess. Eventually, he comes to his senses and is able to fight back against another one of the Orochi, the Second Neck, Sister Miyako. Chikane and Himeko share a kiss.

After Himeko strikes Chikane's chest with her sword, they share a tender moment which ultimately reveals the unpleasant past the two Priestesses have shared in their past lives and how Chikane only pretended to want to kill her as to pay the cost this time around. The Orochi are finally defeated and everything goes back to normal, but at a price the two Priestesses were not ready to accept. At the end of the credits, a special ending is revealed which shows Himeko and Chikane being reunited.