The invasion of Earth by the alien force Jaldas began with the legendary gemstone known as the Black Sphere, said to grant control over the world. Upon learning of its existence, Jaldas launched mysterious energy beams across the planet, destroying the Earth Defense Force's training facility. All trainees stationed there were wiped out—except for Naoami Nozawa, who had left the base to undergo her initiation as a High Ranger. Her departure coincided precisely with the start of Jaldas' assault. Jaldas deployed combat troops from their spacecraft, Hyakufutto, aiming to plunge Earth into chaos. Naoami fought through countless soldiers, finally facing her first real battle as a High Ranger. However, she struggled against Jaldas, her powered suit slashed to pieces. She was then petrified from the legs down by Stone Liquid, immobilized completely. Her Mask—the device powering her suit—was ripped off, leaving her utterly defenseless. In despair and humiliation, she was forced to confront Jaldas' true intentions. Damage accumulated in her headgear, sending waves of agony throughout her body. The stored pain released all at once, forcing her to endure until she collapsed unconscious. Jaldas tormented her further, dissolving her powered suit with Melting Liquid, then stealing the "Trick Capsule"—an item capable of manifesting illusions—and injecting it with Dark Power. When the capsule opened, a grotesque insect emerged, smearing sticky fluid over the High Ranger's body. The creature coiled around Naoami, licking her with a snake-like tongue. Unable to bear the degradation, her body repeatedly defiled, her mind began to shatter. Jaldas then inserted a Memory Worm into her ear, stealing all memories related to the Black Sphere. Naoami was reduced to a plaything for enemy soldiers, her body violated and her psyche utterly destroyed.