Marriagetoxin

The Gero family stands among the elite poison masters, known for their assassination skills. Hikaru Gero, the heir, lives far from romance in the underworld until his sisters are forced to produce an heir for the family. Hikaru was looking for the solution to this problem and met his target, Mei Kinosaki. Hikaru asked her to help him find the bride, and after that, he went out on his most difficult mission of all time.