Yura Yamato is a shy girl who enrolls in Stella Women's Academy. On her first day at the academy, she checks into her dorm to find that her roommate, third year Sonora Kashima is out visiting her family. Looking around the room, she discovers her roommate's collection of military items, such as guns, action guerilla movies etc. At the same time, the C3 Club meets elsewhere in school to discuss the recruitment of new students into the club. After coming up with a ridiculous plan and deciding that it would be unrealistic, they decided to take a break and play a Rambo-style battle to lighten the mood. Rento goes to Yura and Sonora's room to borrow Sonora's M60 and unexpectedly stumbles onto Yura playing with the "props" while watching Rambo. Deciding that yura fulfilled the condition to be recruited, she brought Yura to the C3 Club.

The girls enter a national high-school airsoft tournament, which follows capture the flag rules. The girls manage to win the first round after Yura grabs the opponent's flag and the team continue their winning streak all the way to the finals. There, they are to face Meisei Girl's Academy, who they've always drawn against on previous encounters, one of their member's being Rin Harada, who was Sonora's partner in America. As the match gets underway, Meisei prove to be tough opponents, as they manage to take out the majority of Stella's team, with only Yura remaining. Yura becomes more panicked when she overhears Rin being more focused on taking down every member instead of just stealing their flag and decides to forfeit out of fear. Afterwards, Rin scolds Yura for her cowardess, with Sonora sharing the sentiment. As Yura ponders over her actions, she realizes that if she wants to change, she'll have to make the changes herself.

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 members of C³ finally battle it out?! That's right... the big event is about to begin. They call it the "Field Queen Contest"! And not only are the members of C³ participating, but Aoi and Rin, as well! Each contestant shows off her individual charm during the appeal time event, and then they all face each other one-on-one in an elimination-style survival game battle! Who will take home the victory, and what lies at the end of this battle between passionate young girls?