Wonder Lady, otherwise known as Misaki Reiko, was once a legendary heroine who fought across the cosmos. Years ago, she retired from action upon getting married, choosing to start a new life. However, when her junior heroine Wonder Venus is defeated by an evil organization, Misaki resolves to return to battle. She quickly confronts and defeats the enemy's combat cyborg "Goliath 01" after a fierce struggle. But the evil organization uses its blueprints to develop improved mass-produced combat cyborgs, "Goliath 02" and "Goliath 03," deploying them against her. Wonder Lady is forced to face one new enemy after another. Pushed to her limits, she uses her ultimate techniques to defeat both Goliath 02 and 03, only to be captured when her son is taken hostage, falling into a brutal humiliation. The organization's top commander then offers her one final chance to save her life—by fighting their ultimate combat cyborg, "Goliath 04." Despite facing utter despair, she fights on, refusing to abandon her pride as a heroine. In the end, however, she is mercilessly tortured and destroyed. The story concludes with a tragic BAD END.