Saya keeps spending her days happily at school while hiding her duties as a hunter of Furukimono from her classmates. Itsuki Tomofusa, the class president, does his best to have Saya respond to his feelings without success, while she shows concern for Shinichirō Tokizane, another classmate who rarely speaks to her, but usually watches her from afar.

Saya quickly searches for her sword but does not save Nene in time. After taking a day off to rest, Saya returns the next day only to find that Nono has also been absent from school. Kanako informs them that the school is closing down due to recent incidents. Saya is interrupted on her way home by a dog that is able to converse with her. Soon after, Nono appears and confronts Saya about Nene's whereabouts. A Furukimono forms from Nono's shadows and attacks the civilians. Saya kills the Furukimono but is unable to save Nono as she is killed in the process.

Shinichirō gets Saya to tell her about the Furukimonos, offering to be her confidant. As Saya returns home, she finds Tadoyoshi collapsed on the floor, though he passes it off as a dizzy spell. As the dog talks to Saya, asking her what would happen if she broke the promise she made, she experiences another headache as she recalls something concerning a reward and a punishment. After a few days of no Furukimono activity, Saya returns to school, where a Furukimono appears and attacks the class, killing several students. With no escape available, Saya is forced unsheath her katana in front of her friends to fight the Furkimono.

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.