Yrikawa is a female sex researcher. She and her group of colleagues have dedicated themselves to researching a drug called "aphrodisiac". At the public launch, she announced the product she researched and this was also a good time for her to directly try the product she created to increase its credibility, accuracy and authenticity. It's great that the symptoms of sexual desire have started happening as expected, this shows that her product has been truly successful. But the story did not stop there, after trying the "aphrodisiac", a male colleague took advantage of the effects of the drug that was still in his body and deliberately performed a sexual act that made her unable to move. could not control herself and unintentionally fell into the net of his lust.