Tsukasa Kuon, the sole female member of Earth Defense Force Alpha Team, secretly holds the identity of Next Lady, a special investigator dispatched from the Galactic Federation. To protect Earth and seal away cosmic criminals, she has always fought on the front lines. One day, a giant star beast called Dadango suddenly attacks the city of Ogasu, turning it into a sea of flames. Tsukasa transforms into Next Lady and, after a fierce battle, defeats Dadango—only to discover the entire fight was a trap set by the Goma aliens. The Goma take on fake Next Lady forms with shape-shifting abilities, destroying the city and manipulating humans into believing Next Lady is their enemy. By the time Tsukasa escapes from the enemy base, it's already too late. Humanity now sees Next Lady as a threat and begins attacking her. Worse, the Goma aliens begin to grow giant, launching their final plan to destroy Next Lady in front of the helpless eyes of Earth's people.