From the far reaches of the cosmos, the alien warrior Cosmo Woman inhabits the body of Earth's science defense team member Sakura to battle evil space monsters. One day, the exiled Andromeda space pirates Gori and Ra set their sights on Earth, launching an invasion. Holding a vow to one day return to Andromeda for revenge, Cosmo Woman continues her fight. Gori and Ra plot to steal Cosmo Woman's transformation capsule, their scheme progressing steadily. The science defense team members are captured by Gori and Ra's spaceship. To save her comrades, Sakura transforms into Cosmo Woman and infiltrates the ship, confronting the pirates. A new powerful ally joins Cosmo Woman—Mighty Black, a righteous alien warrior who has pursued Gori and Ra from Andromeda. However, they fall victim to the pirates' cunning traps, facing imminent death. To seize the transformation capsule, Gori and Ra subject Cosmo Woman to humiliating torment—her most sensitive areas stimulated with an electric shock vibrator, while Mighty Black is forcibly cleansed. Worse yet, they are attacked by the reproductive alien Tron from Tron Star, leading Cosmo Woman to suffer the most degrading fate imaginable as a hero of justice.