Special security officer Rei, guardian of priceless artworks, embarks on a new mission to safely transport the masterpiece gemstone "Tears of the Angel." However, the driver acts suspiciously, knocks Rei unconscious with a stun gun, and locks her inside a warehouse along with the gem. When Rei awakens, she activates her Art Guardian powers and fights desperately to protect the treasure, but is ambushed by the Gemou sisters and poisoned. Despite the dire situation, Rei successfully hides the gemstone, but is captured and subjected to brutal torture by lesbian sadists. The Gemou sisters are a pair of fiercely passionate and cruel lesbians, whose merciless cruelty lies at the heart of this story.