Koza Commerce High School

It is one of the five high schools situated in Okinawa, Japan. In the anime, Saya, Kaori, Kai, Riku and Mao are shown to attend the high school. Saya and Kaori reads in the same class. On the school grounds, Mr. Inomine, one of the teachers, gets attacked by a chiropteran. Saya meets Hagi and he forcefully feeds her his blood in a classroom. That stimulates her chiropteran mode and she slays the monster. Kai arrives on time to witness the incident.