An ex-pro gamer of the FPS genre (♂) reincarnated in a fantasy world filled with magic... Only to learn that what greeted him was not a scene from one's dreams, but a muddy battlefield full of bullets flying to and fro! Moreover, he's now an orphan girl named Touri Noel?!After her aptitude for healing magic was discovered, she decided to volunteer in the army as a second-class medic, all to raise money for the orphanage where she was born and raised. However, without even getting magic training, she was attached to an assault squad, repeatedly fighting on the most cruel battlefields of the "Western Front."The mission given to her was to become the personal medic of the frontline's ace, Garback, and not let him die at any cost. But he turned out to be the worst commander, who will try to get results whatever the cost, even if it means the death of his subordinates!On the battlefield, mired in unreasonable orders and violence, Touri's fierce battle for survival continues...

This world has been invaded by bugs.With the appearance of the "Armored Bugs," mutating insect monsters that can overcome all modern weapons, humanity has been robbed of much of its living space. The only ones who can stand against such adversaries are the "Noble Butterflies," girls who harbor "Insects" that have gone through evolutions differing from the armored bugs.One of the candidates to become a Noble Butterfly, Odamaki Ayumi, still suffers from the fact that she is unable to become one. Her best friend, who was supposed to be with her and was her object of admiration, has left her and no longer seeks her company.Those days of despair came to an end when she was on the verge of death in a battle with armored bugs."Don't think that I... will die without doing anything!"With the end near, the girl's body transformed into a butterfly one. And the flapping of her wings will bring about a revolution in the world...!