MARRIAGETOXIN (マリッジトキシン): The Ultimate Battle for Love and Lineage

Have you ever felt like a complete amateur in the world of romance, as if the rules of attraction were written in a language you simply cannot speak? In MARRIAGETOXIN, you experience the high-stakes journey of a man who can master any lethal venom but hasn't the slightest clue how to handle a first date. Imagine the crushing pressure of your family's legacy resting on your shoulders, where the only way to save your sister's future is to find a wife—despite having spent your life in the shadows of the criminal underworld. This story connects with your inner underdog, proving that even a master of death can learn the art of living for someone else.

Summary of the Manga 

The plot of MARRIAGETOXIN, written by Joumyaku and illustrated by Mizuki Yoda, follows Hikaru Gero, the heir to the legendary Poison Clan. To protect his sister from being forced into a political marriage, Gero must find a bride and secure the clan's lineage. His unlikely mentor is Mei Kinosaki, a brilliant cross-dressing marriage swindler whom Gero was originally sent to assassinate. Instead of a kill, a contract is born: Kinosaki will train Gero in the ways of love, leading him to encounter a variety of unique women like the "righteous thief" Kyoko Himekawa and the diligent Shiori Ureshino.

• Authors: Joumyaku (Story) & Mizuki Yoda (Art).

• Genre: Action, Comedy, Romance, Shonen.

• Status: Ongoing (Serialized in Shōnen Jump+ with 17 tankōbon volumes).

• Anime: A high-octane adaptation by Bones Film premiered in April 2026!

If you enjoy stories where a socially awkward but incredibly powerful protagonist enters a world they don't understand to protect those they love, this manga is essential. For its stylized combat and eccentric cast, it is perfect for fans of Sakamoto Days or Jujutsu Kaisen (especially if you love the mix of high-speed assassin action and genuine emotional growth), delivering a lethal dose of entertainment.

Are you ready to find the perfect match in a world of killers?

Read the latest chapters of MARRIAGETOXIN on mangacrest.com and start the hunt for love!