The highly anticipated television anime adaptation of Joumyaku and Mizuki Yoda’s popular manga series, Marriagetoxin, is officially slated to debut in April 2026. The announcement, confirmed in Shueisha’s Weekly Shonen Jump, reveals that the action-romantic comedy will be brought to life by the renowned Studio Bones Film.
An Assassin’s Unexpected Quest for Love
The Marriagetoxin story centers on Hikaru Gero, a top-tier assassin from the centuries-old Poison Clan, one of the five most powerful families of “Masters.” Despite his deadly skills in the underworld, Gero is entirely clueless about romance and has little experience interacting with women.
His life takes an unexpected turn when his clan pressures him to marry and produce an heir to prevent their bloodline from dissolving. To protect his younger sister, Akari—who is threatened with being forced into an arranged marriage against her wishes—Gero reluctantly embarks on a mission to find a wife.
The Unlikely Alliance: Gero and Kinosaki
In a twist of fate, Gero crosses paths with Mei Kinosaki, a brilliant and experienced marriage swindler who is also Gero’s current assassination target. Rather than eliminate Kinosaki, Gero makes an unexpected request: he asks for Mei’s help in navigating the complex world of dating and finding a suitable partner.
This unlikely duo, an assassin with no romantic prospects and a cunning marriage swindler, team up for what they deem “the world’s toughest mission for love.” The series promises a unique blend of high-stakes action, comedic situations, and heartwarming moments as Gero learns the ropes of romance while still dealing with the dangers of the criminal underworld.
Key Staff and Voice Cast Revealed
The production of the Marriagetoxin anime is being handled by Bones Film, a studio known for its work on popular titles such as Fullmetal Alchemist and My Hero Academia.
The core staff members bringing the manga to the screen include:
- Director: Motonobu Hori, known for his work on Carole & Tuesday and Metallic Rouge.
- Series Composition & Script: Kimiko Ueno, who has contributed to Dungeon Meshi.
- Character Design & Chief Animation Director: Kōhei Tokuoka, also recognized for SK8 the Infinity and The Fragrant Flower Blooms with Dignity.
- Music: The score will be composed by Taisei Iwasaki (Belle) and Yuma Yamaguchi (Metallic Rouge).
The main voice cast has also been announced:
- Hikaru Gero: Voiced by Haruki Ishiya, known for his roles in Hibike! Euphonium.
- Mei Kinosaki: Voiced by Shion Wakayama, who has notably worked on Dandadan.
Manga’s Journey to Anime
The Marriagetoxin manga, written by Joumyaku and illustrated by Mizuki Yoda, began its serialization on Shueisha’s Shonen Jump+ mobile app and website in April 2022. As of October 2025, the series has collected 15 tankōbon volumes.
The manga has garnered significant popularity, earning a nomination for the Next Manga Award in 2022 and being ranked among the top recommended comics by Japanese publishers in 2023. Viz Media has licensed the series for English release, with chapters also available on Shueisha’s Manga Plus platform. Fans have praised the manga for its engaging narrative that skillfully balances intense action sequences with genuinely funny and heartwarming romantic elements.
