In the aftermath of a devastating war showcasing the deadly power of weapons, global governments turn to espionage to prevent future calamities. In the Din Republic, Lily, a young and aspiring spy, grapples with self-doubt due to academic challenges. Her dream is revitalized when she is recruited by the enigmatic spy group Lamplight, despite uncertainties. Joining six other girls with similar struggles, they are tasked by the mysterious Klaus with an 'Impossible Mission': infiltrating the Galgad Empire after a mere month of training. Skepticism turns to unity as the girls band together, realizing this mission is their chance to prove themselves in the world of espionage.