From over 100,000 light-years away, the Salalom aliens arrive on Earth with the goal of securing a new habitat. To destroy Earth's cities, they begin an invasion using giant monsters. However, Earth is protected by a guardian known as Excite Lady, who defeats their monsters one after another. Witnessing this, the Salalom aliens use their advanced technology to abduct a girl named Katarina, who belongs to Earth's Defense Organization, and brainwash her. While still in her civilian form, Katarina is forcibly transformed into Excite Lady and connected to a device that induces intense sexual arousal by showing her footage of city destruction. By stimulating her erogenous zones and triggering the secretion of ecstasy-inducing chemicals in her brain, a virtual brainwashing process links acts of destruction directly to sexual pleasure. As a result, she becomes unable to resist either destruction or sexual impulses, turning into a "pleasure doll" constantly craving orgasmic satisfaction. Ultimately, under the complete control of the Salalom aliens, she transforms into a merciless destroyer, endlessly obliterating Earth's cities. [BAD END]