Young entrepreneur Shiori Ureshino’s family business is in trouble! With the schemes of a rival competitor driving her company’s profits down the tubes, Ureshino turns to Gero for help. Will the Poison Master be able to help her turn the company around? Plus, while Gero is busy working with Ureshino, he also finds out that someone’s been manipulating Kinosaki behind his back! The question now is, what nefarious purpose could they possibly have for targeting his marriage advisor?!