Shy high school girl Koharu stops by a mysterious antique shop one day and buys a model kit. To her surprise, she is swept into the mysterious parallel world of the Girl Gun Fight... where only the surviving team can escape.

Koahru's friends Natsuna and Akiho teach her the rules of Girl Gun Fight as she is again drawn back into the parallel world for the next battle...

Koharu (Sei Shiraishi), who thought that this was not a game but a murderer, had a gun after Mizuno (Manami Igashira), who was "Rasuichi", was shot dead in a parallel world and disappeared from the real world. I was scared of that. On the other hand, the Bravo Tango, Matsuko of new student council president on behalf of the Mizuno (Anna Ishii) is, will want to participate as a player, to invoke besides commander of Bianca (Teramoto Rio), began instructs ... !?

Also , Koharu learns that Natsuna (Momoka Ito) is also "Rasuichi" and takes Alice (Yuno Ohara) a more powerful gun "Blast Girl Gun" to prevent Natsuna from dying. Propose a strategy to go to. On the other hand, the speculations of each team overlapped, and a fierce competition began- !?

Koharu (Sei Shiraishi) was told by Matsuko (Anna Ishii) "Don't trust the Girl Gun Lady", but Alice (Yuno Ohara) was a player of Alpha Tango in the past, Masami (Tomi). I will be told the story. The photo at that time on the album shows a battle method called "Plamode" that is unfamiliar to me, and when the girl gun lady and the player's hearts are united, Natsuna (Momoka Ito) activates it. Koharu hears from Akiho (Natsuki Deguchi) ...

On the other hand, Koharu is confused when he is consulted by the enemy team, Higashino (Momoko Tanabe) of Delta Tango, as "Rasuichi". Then, in the "Girl Gun Fight" that was greeted, while covering Natsuna of "Rasuichi", Kitamoto (Ai Mikami) and Higashino of Delta Tango chased after Alpha Tango, a strategy to get the flag, and it was extinct. In a desperate situation- !?

Koharu (Sei Shiraishi) and Akiho (Natsuki Deguchi) teach Natsuna's younger sister Fuyumi (Momoka Ito) about "Girl Gun Fight". In order for Alice (Yuno Ohara) to become a human being and the entire team to survive, it was inevitable to win all the remaining fights and win the championship. Koharu had become "Rasuichi", but decided to fight with all his heart for Alice. And the final battle of fate finally begins.

While the bloody battle is taking place, Matsuko (Anna Ishii) shoots two blast girl guns in rapid succession and hunts down Koharu ...!? And there is a change in Fuyumi who was afraid of the gun.

Matsuko (Anna Ishii) was a girl gun lady ... Matsuko, who won the past "Girl Gun Fight" and became a human from a commander on a sunny day, had a completely unknown memory in the new world. Matsuko, who confessed everything, offers to find a plastic model "Girl Armor" that can destroy the girl gun system for the surviving players before the "final ceremony". Koharu et al. Suspect that Moriyama-sensei (Masanari Wada) is M Taro who made "Girl Armor", and with the cooperation of Hoshimiya-sensei (Aya Asahina), try to find out ...?

Everything became clear. The store manager (Gaku Hamada) created the "Girl Gun System" world by purchasing the "Girl Gun Lady" created by the legendary modeler M Taro. Finally, the ceremony for Alice (Yuno Ohara) to become a human begins, but Koharu (Sei Shiraishi), Akiho (Natsuki Deguchi), and Fuyumi (Momoka Ito) are also restrained by mysterious power and can't move ...! Can

Alice become a human being, and can Koharu and his friends live and return to their original world?

The last of the shock is clear ...