Ayumi, a skilled investigator who has solved many difficult cases, is ordered to solve a disappearance case. It turns out that the missing people disappeared after stopping by a certain bar, and Ayumi infiltrates the bar as a customer. However, the bar turns out to be a lesbian cruising spot, and a mysterious woman named Hibiki approaches her to inquire about the people there. She is drugged and her body, which is unable to move freely, is violated... While struggling between her "pride as an investigator" and the "lesbian pleasure that corrodes her body and mind," she falls into the hell of bondage and slavery training...