Marriage Toxin, Vol. 9 by Joumyaku

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 taking on his toughest 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 will do whatever it takes to get Gero hitched—even if they have to take on the entire criminal underworld in the process!

Thanks to the help of Sound Master Naruko, Gero is fully recovered and ready to rescue Himi from the wedding from hell! But Ghost Master Sakazuki is lying in wait, with plenty of tricks up his sleeve. And even if Gero can figure out how to save Himi, will he ever realize her true feelings for him?