Koharu (Sei Shiraishi) suggested to Matsuko (Anna Ishii), "Why don't you stop killing each other?" Promising not to follow the instructions of commander Alice (Yuno Ohara), and getting consent with certain conditions. And in the real world, Charlie Tango's Ichika (Azusa Ohara) and Futaba (Rina Kannan), Megumi Mitsu (Hina), Kitamoto (Ai Mikami), Minami (Aoi Uta), 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 gather in the classroom despite the fight and have a "commemorative party where no one dies". Start with…!?

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 ...?