Learn to Hit the Target Without Firing.
Sonora and Rento decide to give Yura some training at an Inari shrine, with Sonora lending Yura a Škorpion vz. 61 airsoft gun she got from her teacher. Along the way, Yura thinks she can see a white fox, but the others pass it off as her active imagination. They first task Yura with hitting a dangling coin, teaching her to aim without aiming. Although she manages to hit it at a close distance, she starts to struggle afterwards. As the group head back for the day, Yura discovers her gun has gone missing and rushes back to the shrine alone to search for it. There, she meets a curious warrior spirit named Choujirou, who shows Yura a world that blends his tragic past with Yura's delusional world. He tries to have Yura prevent his own death by an arrow, but she is unable to pull it off. Upon returning to the dorms and hearing that the Skorpion is nicknamed Choujirou, Yura tells what she experienced to Sonora, who tells her about her teacher who was killed in action. The next day, as Yura returns to the shrine to reenter that world, Rento finds herself brought into the world as well, where she witnesses her shoot the arrow, which in real life translates to her hitting the coin right in the center from a long distance. As a reward, Sonora allows Yura to keep the Skorpion.
Aired 26/07/2013EP 4 - Learn to Hit the Target Without Firing.

Stella Women's Academy, High School Division Class C3
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).
(Source: Anime News Network)