In the midst of a sudden invasion by violent insect-like aliens known as Inzectors from outer space, Bird Five, a secret ninja task force formed to protect humanity, stands as the last line of defense. At the heart of Bird Five is Bird Blue—Minami Arase—who, during battle, is struck by the venomous stinger of Scorpio, a scorpion-like alien, causing her transformation to deactivate. Captured in her civilian form, she endures brutal torture akin to a lynching, barely clinging to life while her transformation bracelet is stolen. Now completely at the mercy of Scorpio and Mandas, she is subjected to relentless torment. Yet Minami overcomes her suffering, reclaiming her pride as she confronts Mandas head-on. After a fierce battle, she analyzes the special bracelet created by Scorpio and fires a beam weapon capable of deactivating transformations, striking Mandas and forcing him back to his true form. Victorious, she defeats both Scorpio and Mandas, bringing the conflict to an end—only to realize this victory marks not salvation, but the tragic conclusion of her own downfall. (BAD END)