Koharu (Sei Shiraishi) was suddenly summoned to a parallel world and decided to participate in 'Girl Gun Fight'. The next day, at a school in the real world, Koharu learns about the mechanism of Girl Gun Fight from teammates Natsuna (Momoka Ito) and Akiho (Natsuki Deguchi) and breaks down. And Koharu begins to touch 'friendship' that was unrelated until now, but Natsuna and Akiho have a big secret in Koharu ...
On the other hand, when Koharu talks to Moriyama (Masanari Wada) in her infirmary, Matsuko (Anna Ishii) is there. She still seems to be reluctant to the plastic model ... In addition, Koharu is ruthlessly summoned to the parallel world tonight and bites into reality. Under the orders of each team's commander, Alice (Yuno Ohara), Bianca (Rio Teramoto), Charlotte (Momoka Ishida), and Daisy (Sakura Ando), the bloody survival game 'Girl Gun Fight' has begun tonight.

Koharu (Sei Shiraishi) suggested to Matsuko (Anna Ishii), 'Why don't you stop killing each other?' She promised not to follow the instructions of Commander Alice (Yuno Ohara) and decided to get consent with certain conditions. And in the real world, Charlie Tango's Ichika (Azusa Ohara) and Futaba (Rina Kannami), Megumi Mitsu (Hina), Kitamoto (Ai Mikami), Minami (Utano Aoi), and Higashino (Momoko Tanabe) of Delta Tango. Koharu, who approached the story, succeeds in promising each other that they will not kill each other in 'Girl Gun Fight'. When the Girl Gun Fight begins, Alice notices the light bullets that the players miss and the strange atmosphere ...!?

On the other hand, the players gathered in the classroom even though they were fighting and started a 'commemorative party where no one died' ...!?