MarriageToxin offers a refreshing blend of action, romance, and comedy. Joumyaku and Mizuki Yoda skillfully balance the dark undertones of Gero’s hitman background with lighthearted moments of romantic tension and character growth. The dynamic between Gero and the marriage swindler creates a fascinating contrast, with Gero’s stoic personality clashing with the swindler’s charming and manipulative nature.
The emotional core of the story stems from Gero’s internal conflict — his loyalty to his clan clashes with his personal feelings about marriage and relationships. His protective instincts toward his sister fuel his determination, adding emotional weight to his journey.
The humor comes naturally through the awkward yet heartfelt interactions between Gero and the swindler. Despite the comedic tone, the series doesn’t shy away from exploring deeper themes of family pressure, personal agency, and self-worth.
Yoda’s art effectively captures the tension and humor of each scene. The action sequences are fluid and intense, while the romantic and comedic moments are enhanced by expressive character designs and detailed backgrounds. The pacing strikes a balance between action-driven plots and emotional development, keeping readers invested in Gero’s journey.
Plot of MarriageToxin

Gero comes from a long line of assassins, where marriage and producing an heir are seen as essential for the clan’s survival. Despite his lethal skills and sharp instincts, Gero struggles with social interactions and views marriage as an impossible task.
His family issues an ultimatum — either he gets married and has a child, or his younger sister will be forced to take on the responsibility. Unwilling to let his sister face such a fate, Gero resolves to find a partner.
Gero’s path crosses with a cunning marriage swindler, whose skill at manipulating romantic situations contrasts sharply with Gero’s straightforward, no-nonsense personality. Despite their initial clash, the swindler agrees to help Gero navigate the complex world of relationships — for a price.
As Gero and the swindler encounter dangerous foes from Gero’s past and rival clans, their partnership evolves from convenience to mutual trust. Gero’s emotional walls begin to crack as he opens up to the swindler, discovering that love and vulnerability may be his greatest strengths.
The combination of deadly combat, romantic tension, and comedic misunderstandings creates a dynamic story where Gero must reconcile his clan’s expectations with his own desires. The growing connection between Gero and the swindler hints at deeper emotional stakes that could redefine their future.
MarriageToxin Chapter 121 Release Date and Time

MarriageToxin Chapter 121 is scheduled for release on Tuesday, March 25, 2025. The release times for various regions are as follows:
- Japan Standard Time (JST): Wednesday, March 26, 2025, at 12:00 AM
- India Standard Time (IST): Tuesday, March 25, 2025, at 8:30 PM
- Greenwich Mean Time (GMT): Tuesday, March 25, 2025, at 3:00 PM
- Philippines Standard Time (PHT): Tuesday, March 25, 2025, at 11:00 PM
- Korean Standard Time (KST): Wednesday, March 26, 2025, at 12:00 AM
- Eastern Time (EST): Tuesday, March 25, 2025, at 10:00 AM
- Central Time (CST): Tuesday, March 25, 2025, at 9:00 AM
- Mountain Time (MST): Tuesday, March 25, 2025, at 8:00 AM
- Pacific Time (PST): Tuesday, March 25, 2025, at 7:00 AM
- Australian Capital Territory (ACST): Wednesday, March 26, 2025, at 2:00 AM
Where to Read MarriageToxin Chapter 121
You can read MarriageToxin Chapter 121 on Viz Media and Manga Plus for the official English version. Supporting the official platforms helps maintain accurate translations and ensures the series’ continuation.