Iris, a pilot of the massive SSF101 armored suit, is ambushed during a mission and captured by the ruthless Orc race. Sold into slavery as a rare Earthling specimen, she is purchased by a sadistic collector who seeks to break her will using a potent aphrodisiac. Just as Iris succumbs to the drug's influence, her comrade Meiri arrives to rescue her from her nightmare.
Iris wakes up to find her former friend Meiri, now calling herself Riruru, has turned her into a commodity. Through a biological reconstruction called Ecstasia, Iris's libido and sensitivity are artificially amplified, stripping away her willpower. Forced into prostitution, Iris is subjected to various clients, including a fetishist and a tentacled alien, eventually succumbing to the overwhelming pleasure and losing her noble identity to her new, enslaved existence.
Iris suffers a brutal betrayal when Riruru delivers her to the lustful Duck People of Darktown. As Iris attempts to uncover Riruru's true identity as her former comrade Meiri, she is subjected to the sadistic experiments of Doctor B. By linking their nervous systems, the mad scientist forces Iris to experience his own overwhelming lust, further eroding her will and plunging her deeper into a cycle of degradation.
Iris endures further degradation and psychological warping under Bozuk's sadistic control in Darktown. When she attempts to escape with the help of the enigmatic Riruru, she discovers that Riruru is actually Meiri, who developed a split personality as a defense mechanism against severe trauma. Despite being forced back into submission to save her friend, Iris successfully transmits a distress signal to her team, sparking a desperate rescue mission.