"Once upon a time, fairies were tools of war." The narrative is set in a world where fairies inhabit and reside within animals, granting them enigmatic powers. By extracting the organs of a possessed animal and transplanting them into humans, fairies can be summoned as an alter ego and utilized as weapons. Individuals who employed fairies in this manner were known as "Fairy Soldiers." After the war concluded and their duties ended, these soldiers lost their original purpose. Some took employment with the government, others joined the mafia, and some even turned to terrorism, as each selected their own path in life. Nine years have elapsed since the war. The protagonist, Mariya, is a new recruit at "Dorothea," an organization that investigates and suppresses crimes related to fairies. Amidst an unstable political climate, criminals bearing lingering wounds from the war and past conflicts emerge, engaging in terrorism as an act of revenge. This is the story of Fairy Soldiers, fighting for their own justice in a chaotic postwar world.