The popular manga series Marriagetoxin is making its way to television screens very soon. Fans of the action-packed romantic comedy can mark their calendars for April 2026, when the anime adaptation finally arrives. The show, produced by Studio Bones Film, brings together a skilled assassin and a marriage swindler for one of the most unusual love stories in recent memory.
The manga, written by Joumyaku and illustrated by Mizuki Yoda, has been running on Shueisha‘s Shonen Jump+ platform since April 2022. With 16 collected volumes already available, the series has built a loyal following. Now, the anime version is set to bring this chaotic and funny story to life.
Exact Premiere Date and Broadcasting Details
Marriagetoxin officially debuts on April 7, 2026. The show will air on Fuji Television and other FNS (Fuji Network System) stations across Japan. This marks a major milestone for the franchise, which started as a web manga and has grown into one of Shonen Jump+’s more talked-about titles.
The production team behind the anime includes some experienced names in the industry. Motonobu Hori, known for his work on Carole & Tuesday, serves as director. Kimiko Ueno handles the script and series composition. Kohei Tokuoka is the chief animation director. The music comes from Taisei Iwasaki (Belle) and Yuma Yamaguchi (Metallic Rouge).
Global Streaming and International Release
For viewers outside Japan, Marriagetoxin will be available on major streaming platforms. While the complete global streaming list is still coming together, the series is expected to follow the pattern of other Shonen Jump+ adaptations. Platforms like Crunchyroll, Netflix, or Hulu often pick up these shows for international audiences.
Fans in USA, UK, Canada, Australia, and India can expect the series to stream with subtitles shortly after the Japanese broadcast. Dubbed versions may follow later. Viz Media, which licenses the manga for English release, is likely involved with the anime distribution as well.
Voice Cast: Who Is Playing Who?
The main cast for Marriagetoxin has been announced through official channels. Haruki Ishiya voices the lead character Hikaru Gero, the skilled assassin who knows nothing about romance. Shion Wakayama plays Mei Kinosaki, the clever marriage swindler who agrees to help Gero find a wife.
“When we meet with the anime staff, we always say ‘The contents are pretty chaotic…’ as the opening line of each meeting, so it’s like a catchphrase for this title,” said director Motonobu Hori in a recent interview.
Other cast members include Anna Nagase as Kyoko Himekawa, Asaki Yuikawa as Shiori Ureshino, Hinano Shirahama as Kimie Arashiyama, and Mariya Ise as Shizuku Ushio. Soma Saito voices Genya Naruko, Shimba Tsuchiya plays Piichi Nakagawa, and Haruka Shiraishi appears as Akari Gero.
Plot Summary: An Assassin’s Unusual Marriage Hunt
The story follows Hikaru Gero, a young man from the Poison Clan, a family of professional assassins that has existed for hundreds of years. Gero has spent his entire life in the dark side of society. He has no experience with women and no interest in marriage. He planned to let the family bloodline end with him.
But everything changes when the clan’s leader, Gero’s grandmother, makes a shocking demand. If Gero does not marry and produce an heir, his younger sister Akari will be forced to bear a child against her wishes. Akari is a lesbian with a girlfriend, and Gero refuses to let his sister lose her chance at true love.
Desperate to save his sister, Gero approaches his next assassination target—Mei Kinosaki, a beautiful and skilled marriage swindler. Instead of killing Kinosaki, Gero asks for help. He wants Kinosaki to teach him how to date, how to talk to women, and how to find someone he can truly love.
Kinosaki agrees, but not for free. The swindler needs money for a younger brother’s medical expenses. Together, this unlikely pair begins a journey filled with dangerous missions, strange encounters, and unexpected feelings.
What Makes the Story Unique
The manga blends action, comedy, and romance in a way that feels fresh and unpredictable. Gero is a killer who can use dozens of different poisons to enhance his strength, speed, and senses. But he cannot hold a normal conversation with a woman to save his life. Kinosaki, on the other hand, can charm anyone but has no fighting skills at all.
Director Hori explained the show’s special quality in that same interview:
“For example, there’s a scene where Naruko sits in a massage chair in a tree, and it’s obviously impossible. But they don’t try to apply logic to it, they just illustrate something absurd as absurd. The momentum of the story just allows you to enjoy it as it is.”
The series also features a colorful cast of supporting characters. These include other assassin families like the Beast Clan, the Bug Users, and the Water Users. Each group has its own unique abilities and fighting styles. Gero must face them all while trying to impress potential marriage candidates.
Manga Background and Popularity
Marriagetoxin first appeared on April 20, 2022, on the Shonen Jump+ platform. The series quickly gained attention for its unusual premise and strong artwork. Mizuki Yoda, the illustrator, previously worked as an assistant to Gege Akutami, the creator of Jujutsu Kaisen. Akutami even provided a recommendation for the manga’s third volume.
The series earned an eighth-place ranking in the Next Manga Awards 2022 in the Best Web Manga category. It also placed fifth in the Nationwide Publishers Recommended Comics of 2023. The manga has received praise from several notable creators, including Koyoharu Gotouge, the author of Demon Slayer.
As of January 2026, the manga has 16 collected volumes in Japan. Viz Media releases the English version under the title Marriage Toxin, with four volumes available so far. The series remains ongoing, with new chapters appearing weekly on Manga Plus, Shueisha’s official platform.
Episode Count and Season Structure
Official sources have not confirmed the exact number of episodes for Marriagetoxin’s first season. Based on similar Shonen Jump+ adaptations like Dandadan and Kaiju No. 8, fans can expect between 12 and 13 episodes. The production team at Bones Film has a strong reputation for quality animation, having worked on Fullmetal Alchemist and My Hero Academia.
The first season will likely cover the early volumes of the manga, introducing Gero, Kinosaki, and the first few potential marriage candidates. These include Kyoko Himekawa, a thief who steals art to return it to its owners, and Shiori Ureshino, a college student who will one day run her family’s party supply company.
What Fans Can Expect
Viewers should prepare for a show that does not take itself too seriously. The action sequences are intense and creative, with Gero using different toxins to overcome powerful enemies. But the romantic moments are awkward and funny, as Gero struggles to say the right thing to women.
Kinosaki serves as the perfect counterbalance. The marriage swindler dresses in women’s clothing and uses charm as a weapon. But Kinosaki is also a caring older brother who understands what it means to sacrifice for family. The relationship between Gero and Kinosaki grows from a simple business deal into a genuine friendship.
The series also touches on themes of family obligation, personal freedom, and finding happiness on your own terms. Gero starts the story believing he does not deserve love. By the end of the first arc, he begins to see that everyone, even a killer, can find someone who accepts them.
How to Watch and Stay Updated
Japanese viewers can watch Marriagetoxin on Fuji Television starting April 7, 2026. International fans should check Crunchyroll and Netflix for streaming announcements closer to the release date. Viz Media and Manga Plus offer the original manga for those who want to read ahead.
The official Marriagetoxin website and social media accounts will post updates about additional cast members, theme song artists, and streaming partners. Given the show’s April premiere, promotional trailers and key visuals are expected to drop in the coming weeks.
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