Naomi becomes a spy with the mission of destroying the organization "X" that killed her father, infiltrating it alone. After two years of effort, she earns the trust of the organization's boss, Sawaki, and obtains crucial classified information. Just as she takes the final step toward X's destruction, an unexpected incident occurs. Her lover and colleague Aoki, worried about her, approaches the organization and is captured. To protect Aoki, Naomi's true identity is exposed, and she is subjected to the organization's torture in front of her lover.