Birdswan, the protagonist of the ninja avian hero series Bird Force, finds herself in dire straits during a battle against Planton, a plant monster from the evil organization Galagarn. Undeterred by the crisis, Birdswan seizes an opening and launches a counterattack. Using her sharp tactics and strength, she defeats Planton—only for Kuroikatcher, a high-ranking officer of Galagarn, to appear immediately afterward. Having exhausted her strength, Birdswan is captured and taken to their hideout. Seeking to extract information, Kuroikatcher resorts to torture. Mistress Greda, a female torturer, arrives on the scene and subjects Birdswan to intense torment using needles, whips, and other implements. The torture intensifies relentlessly, pushing Birdswan to her physical and mental limits. Can she overcome this hopeless situation? The answer lies etched within the story's conclusion.