Marriage Toxin

Marriage Toxin is a Japanese manga series written by Joumyaku and illustrated by Mizuki Yoda.

Marriage Toxin is a Japanese manga series written by Joumyaku and illustrated by Mizuki Yoda. It follows Hikaru Gero, an assassin from a poison clan, who seeks help from a marriage swindler to find a wife and protect his younger sister from being forced into an arranged heir-producing role. The series began serialization on Shonen Jump+ in 2022 and has also been adapted into an anime series.

Premise

The manga follows Hikaru Gero, a young assassin from a powerful poison clan, who is pressured to produce an heir. To stop his sister from being forced into that role, he asks Mei Kinosaki, a marriage swindler, to coach him in romance.

Publication

Marriage Toxin is written by Joumyaku and illustrated by Mizuki Yoda. It has been serialized on Shonen Jump+ since April 2022 and is published by Shueisha, with English-language release through Viz Media.

Adaptation

The series was adapted into an anime television series that aired in 2026. A second season was announced for 2027.

Genre and themes

The series blends action and comedy with romantic and family-line succession themes. Its story uses an unconventional setup involving assassins, matchmaking, and marriage fraud.