The highly anticipated TV anime adaptation of Joumyaku and Mizuki Yoda’s hitman/marriage swindler manga, Marriage Toxin, has revealed its first full-length trailer, an updated main visual, and a host of new cast members, generating significant buzz among fans. The series, animated by BONES Film, is officially slated to premiere in April 2026.
The new trailer offers an action-packed glimpse into the unique premise, showcasing protagonist Gero, an elite assassin, and marriage swindler Kinosaki as they navigate a perilous world in pursuit of the “ultimate marriage”. Viewers can expect to see intense battle sequences featuring Gero’s top-tier assassin skills, alongside introductions to various deadly assassins and charming characters who will play a role in Gero’s mission.
Expanding the “Marriage Toxin” Voice Cast
The latest announcement introduces several prominent voice actors joining the previously confirmed main cast. Shion Wakayama is set to voice Mei Kinosaki, with Haruki Ishiya portraying Hikaru Gero.
The newly revealed cast members and their respective roles include:
- Anna Nagase as Kyoko Himekawa
- Mariya Ise as Shizuku Ushio
- Asaki Yuikawa as Shiori Ureshino
- Soma Saito as Genya Naruko
- Hinano Shirahama as Kimie Arashiyama
- Simba Tsuchiya as Piichi Nakagawa
- Haruka Shiraishi as Akari Gero
- Isamu Yusen as Toshiki Hanamaki
Voice actors like Anna Nagase (Kyoko Himekawa) have expressed excitement about the unexpected combination of “marriage hunting” and “hitmen” in the original manga, highlighting the unique appeal of the series.
Character Introductions and Voice Actor Insights
The announcement provided brief descriptions for some of the new characters:
- Kyoko Himekawa (voiced by Anna Nagase): Described as highly skilled in communication and passionate about sharks, Kyoko works to recover unjustly taken art.
- Shizuku Ushio (voiced by Mariya Ise): An underworld businesswoman and Water Master, known for her thoroughness and always sporting a diving suit.
- Shiori Ureshino (voiced by Asaki Yuikawa): A college student and heir to a major party supply corporation, she is shy but desires to change, with a hobby of performing magic tricks.
- Genya Naruko (voiced by Soma Saito): A descendant of the Sound Master lineage, Genya is handsome, popular, and possesses a unique aura and way with words.
- Kimie Arashiyama (voiced by Hinano Shirahama): A “Hamster Master” and a branch descendant of the Beast Master bloodline, with a highly skilled hamster partner named Sirius. She is a secret admirer of Gero.
- Piichi Nakagawa (voiced by Simba Tsuchiya): An ordinary human with genetic anomalies, possessing abilities far beyond a Master, including exceptional information processing and superhuman physical attributes, though requiring extensive sleep. Simba Tsuchiya described Piichi as embodying “love” with both kindness and madness.
Production Details and Creative Team
The Marriage Toxin anime is being produced by the MARRIAGETOXIN Project, with animation handled by BONES Film, a studio renowned for popular titles like My Hero Academia and Gachiakuta. Production supervision is also by Bones.
The key staff members bringing this unique story to life include:
- Director: Motonobu Hori (known for Carole & Tuesday and Metallic Rouge)
- Series Composition & Script: Kimiko Ueno (of Astro Note fame)
- Character Design & Chief Animation Director: Kohei Tokuoka (worked on SK8 the Infinity and The Fragrant Flower Blooms with Dignity)
- Music: Taisei Iwasaki (from Belle) and Yuma Yamaguchi (Metallic Rouge)
Additional staff members contributing to the production include Yurika Sako (Sub Character Design), Kotono (Costume Design), Ayumi Nagaki and Ryo Hirata (Prop Design), Toshiki Amata (Art Design), Bihou (Art), Hiroko Umezaki (Color Design), Go Kanbayashi (Photography Director), SANZIGEN Inc. (3DCG), Taiki Nagashima (CG Animation Director), Kumiko Sakamoto (Editing), Haru Yamada (Sound Director), and Tomokazu Mii (Sound Effects).
“Marriage Toxin” Manga Background
The original Marriage Toxin manga, written by Joumyaku and illustrated by Mizuki Yoda, has been serialized on Shueisha’s manga app Shonen Jump+ since April 2022. Viz Media has licensed the series for English release, describing the plot as an assassin named Gero, desperate to prevent his sister from being forced to bear an heir for their clan, turning to a marriage swindler named Mei Kinosaki for help in finding a wife. The series is lauded as an “intense marriage hunting battle action story”. As of October 2025, 15 tankōbon volumes have been collected, with the 16th volume set for release in January 2026.
The TV anime adaptation is set to air on the Kansai TV and Fuji TV network. Fans can anticipate an exciting blend of action and romantic comedy when Marriage Toxin premieres in April 2026.
