Detective Sakaki Mayu, a member of the Special Unit of the Teito Investigation Bureau, secretly leads a double life as Tales Artemis, a beautiful girl warrior who fights evil beyond the reach of the law. During an investigation, she captures the wanted criminal Katase, from whom she senses an unnatural malice. Her instincts prove correct when Katase transforms into a monster, his tentacles lunging deep into Mayu's throat. Overwhelmed by intense nausea, she realizes the horror—this is the monster's "seed." Unconscious, Tales Artemis is sealed inside a special capsule, forced to endure 45 days of captivity while the seed matures, all under Katase's humiliating control. "You are my parent, my breeding ground, and my food," he declares, and as the meaning of his words becomes clear, TA is gradually brainwashed, eventually reduced to a sexual servant. Facing this ultimate degradation, a final question remains: if the brainwashing were to break, what true hell would await TA? This choice becomes the pivotal turning point that decides the fate of the story!