Aya Yamanaka, a crew member of the spaceship "Explorer-Zero"—the first human-made vessel to traverse a wormhole—crash-lands on Sangha, a planet nearly identical to Earth, after an unforeseen accident. Due to the planet's atmosphere, Aya gains superhuman abilities and becomes "Earth Lady," fighting to save the lawless world of Sangha. One day, she discovers Parnas, a terrorist who destroyed the drug factory of the evil empire "Mazoo," under attack by Mazoo's elite guards, and rescues him. Moved by his cause as a vigilante fighting for peace, Earth Lady offers to assist him. However, Mazoo manipulates Parnas, using him to uncover Earth Lady's weaknesses.