Marriagetoxin

Marriagetoxin follows Gero, a young assassin from a long line of killers who works for a secret organization. Despite his lethal skills, Gero is deeply introverted and yearns for a normal life, especially marriage and a family. When assigned to kill a female target, he cannot go through with it. Instead, he proposes a radical plan: marry the target to get close and complete the mission from within a domestic setting. This leads to a darkly comedic cohabitation where Gero balances deadly assignments with the mundane tasks of being a husband, all while genuine feelings begin to complicate his original mission.

The series is written and illustrated by the duo Jōmyaku and Mizuki Yoda. It began serialization on April 25, 2022, on Shueisha's Shōnen Jump+ platform. As of April 2026, 17 tankōbon volumes have been released under the Jump Comics label. Viz Media handles the English release in digital and print formats. An anime adaptation produced by Bones Film premiered in April 2026, covering the first major arc.

Marriagetoxin has received positive reviews for its unique premise and character dynamics. Critics praise the strong chemistry between the leads and the blend of dark humor with sincere romance. The artwork by Mizuki Yoda is noted for clean lines and expressive designs. The series won the Shogakukan Manga Award in the Shōnen category in 2025 and has over 4.5 million copies in circulation as of early 2026. A spin-off titled Marriagetoxin: Wedding Days began serialization in late 2025, focusing on side characters and slice-of-life scenarios.[edit]