Gero may be a master assassin, but he's not exactly killing it in the romance department! Can marriage swindler Kinosaki help him find true love? Poison Master Hikaru Gero is about to take on his most challenging assignment yet-getting married! Gero couldn't be more clueless when it comes to dating, but thankfully, marriage swindler Mei Kinosaki knows everything there is to know about love. Together, this unlikely pair is going to do whatever it takes to get Gero hitched-even if they have to take on the entire criminal underworld in the process! Kinosaki signs Gero up as a driver for underworld bodyguard Chinatsu Akakura, but this job is no Sunday drive! With an entire clan of pinwheel masters on their tail, Gero will have to help Akakura protect her charge Erina Zao at all costs-and if Gero wants to win Akakura's heart in the process, he may be out of luck unless he can win over Zao first...