Marriage Toxin, Vol. 12

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!

Himekawa has made quite the name for herself as an art thief, but when she suddenly finds herself in need of a partner in crime, Hamster Master Arashiyama is just the girl for the job! While it's not the partnership Gero expected to see formed in his quest for marriage, that won't stop this new dynamic duo from taking the criminal underworld by storm!

Author: Joumyaku
Publisher: Viz Media
Published: 04/07/2026
Pages: 216
Binding Type: Paperback
ISBN13: 9781974761074
ISBN10: 197476107X
BISAC Categories:
- Comics & Graphic Novels | East Asian Style | Manga | General
- Comics & Graphic Novels | Action & Adventure
- Comics & Graphic Novels | Humorous

About the Author
Joumyaku kicked off his career in 2021 when he wrote two one-shots, "Hyper Hard Special Mission" and "Reisougyou no Arai-kun" (Ghost Sweeper Arai-kun), published in back-to-back months of Jump+. The following year, Joumyaku partnered with Mizuki Yoda to release his first serialization, Marriage Toxin.

Mizuki Yoda first hit the manga scene with his one-shot "Jigoku no Sata mo Ryuu Shidai" (The State of Hell Depends on the Dragon), which was published in Shonen Jump NEXT! in 2015. In 2016, he and Tomohide Hirao teamed up to create the one-shot "Legacy," which ran in Weekly Shonen Jump as part of the Gold Future Cup. His first series, Ne0;lation, was completed in 2019, and three years later he began working on his next series, Marriage Toxin, for Jump+.