Marriage Toxin, Vol. 2 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!

After assessing Gero’s romantic qualities (or lack thereof), Kinosaki decides the best strategy to find Gero a wife is to use his impressive talents as an assassin instead! Together they respond to a job listing to rescue Himekawa, an art thief who’s been taken hostage—but with a water master now standing in their way, their plan takes a turn for the worse! Can Gero win this fierce battle of poison versus water and take his first step toward marital bliss?