Stella Women's Academy, High School Division Class C³, Stella Jogakuin Koutouka C3-bu, Stella Jogakuin Koutou-ka C3-bu, Stella Women's Academy, High School Division Class C3, ステラ女学院高等科C³部（しーきゅーぶ）
Stella Jogakuin Koutou-ka C³-bu
Yura Yamato has just arrived at the high school division of Stella Women's Academy, when Sonora Kashima invites her to join a club called "C³". Sonora is the third-year student who became the new head of this club for military survival games. The other members include two second-year students (part-Japanese Karila Hatsuse and G36K-wielding Honoka Mutsu) and two other new students (Rento Kirishima whose family runs a Japanese sweets shop and the really short Yachiyo Hinata).