On this day, a girl was wandering the streets searching for her friend who had been abducted by the Kuroshishi-kai and gone missing... It was Maeno Nana. Nana received information from one of her friends... She headed to the location alone, but it turned out to be a trap set by the Kuroshishi-kai! Not realizing that the location was the Kuroshishi-kai's hideout, she was forced to drink a drink laced with an aphrodisiac, restrained, and unable to move. She tried desperately to endure the pleasure torture, but her body and mind were corrupted. Will Nana be able to withstand the strongest pleasure training in history?