Yrikawa is a female sex research expert, and she and her team of colleagues have devoted themselves to researching a drug called "aphrodisiac". At the public premiere, she announced the product she researched and this is also a good time for her to directly try the product she created to increase her credibility, accuracy and it's amazing when the libido symptoms have started to take place as expected. This shows that her product has been really successful. But the story didn't stop there, after trying "aphrodisiac", a male colleague took advantage of the effect of the drug that was still seeping inside her body and deliberately performed an erotic act that made her unable to control herself and accidentally fell into his sexual net.