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.

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.