Saya begins her morning meditating on a light that continues to escape her grasp. Her trance is broken by her father reminding her to hurry up if she wants to eat breakfast before school. At school she converses with her friends before having to head home early to their disappointment.

At home her father hands her a katana and tells her to slay the Elder Bairn.

Saya struggles to keep the Furukimono from killing more students as she becomes tormented with flashbacks. Although she eventually manages to kill the Furukimono, all of her classmates besides Itsuki had been killed. After lamenting to the dog, who poses more questions about her nature, and being visited by Shinichirō, Saya comes to the realisation that only her class had been called to school that day. As Shinichirō's attempt to confess to Saya is put off by the arrival of Tadayoshi, Saya questions why she doesn't know her mother's name.

Saya finally remembers that, having been captured by Fumito, she had her memories altered and was put on a stage to feed on Furukimonos as a test to see if she would change. Fumito has the Furukimono to kill Shinichiro, Nene and Nono for disobeying their orders. Saya kills the Furukimono before it can kill Kanako, but she is instead killed by Takayoshi who is revealed to be half-Furukimono that has gone beserk from drinking Saya's blood. As Saya fights against Tadayoshi, she manages to obtain a powerful light, allowing her to defeat him. As Fumito makes his escape, sending an army of multiplying Furukimono to kill everyone in town, Itsuki sacrifices himself in order to protect Saya, admitting he had fallen for her before passing away. After beating the Furukimono, Saya tries to attack Fumito before he escapes, but is shot in the head. Left along on the island, Saya treats herself and prepares to make her next move.