Stella Women's Academy, High School Division Class C³

Yura Yamato is a new student at Stella Women's Academy's high school division, where she's introduced to the C³ club by Sonora Kashima. As the third-year head of C³, Sonora oversees the club's focus on military survival games. The club consists of several students, including Karila Hatsuse and Honoka Mutsu, both second-year students, and other newcomers Rento Kirishima and Yachiyo Hinata.