In the year 2034, a large war had been going on for 4 years. Ever since a military accident near Ayato’s hometown last year, the townspeople had been fleeing the town due to fear of the army and encroaching battle lines. Now only those who are too old to move or had to stay in the town due to connections remained. With most of the students gone, his school was closed down and taken over by the ground self-defense forces as an engineering school for the girls-only #0 squadron of the 2nd ward. He didn’t like danger, but he was a bit curious and ended up joining their school as an outsider along with his two friends, Kentarou and Yuina. His views change when he realizes that even though the girls are in the army, they are still just girls. However, when gunfire soon broke out in the skies overhead and the oldest member of the squadron Sayaka went missing, the peaceful rural life that he once knew was no more.