In a devastated world, a mysterious girl gazes into the distant sky while a high school girl named Ichi stands still, carrying an array of swords and heavy armaments. The story follows what they will witness in this ruined landscape and what kind of tale they will weave together. The setting juxtaposes the ordinary routines of school life with the harshness of combat, as these young women navigate a conflict-ridden environment armed with advanced military technology. The narrative focuses on Ichi as the central figure, whose silent resolve and arsenal define her role in the unfolding events. The series explores the contrast between innocence and brutality, building its arcs around the characters' encounters and the mysteries of their shattered world.