The spring 2026 anime season offers plenty of isekai and fantasy anime, but that doesn't mean it's missing the shonen genre. Marriage toxin is an upcoming shonen anime and is one of the most talked about manga series in modern times, all thanks to its engaging story that tells the story of an incredibly likable assassin who simply wants to find the love of his life with the help of a marriage con artist.
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Marriage toxin brings a unique story for fans to consume that is rarely seen in the shonen genre. The source material was well received by fans, so it goes without saying that there is a dedicated fan base willing to support the anime adaptation Marriage toxin right from the start. That means it's time to meet poison expert Hikaru Gere and marriage con artist Mei Kinosaki this spring!
Marriagetoxin brings together a hit man and a marriage cheat
Meet Hikaru Gero and Mei Kinosaki
The shonen genre is never lacking when it comes to anime characters who take human lives as their profession. We recently received Sakamoto Taro from Sakamoto daysbut now comes Hikaru Gero from the popular MarriageToxin manga series. The upcoming anime adaptation will debut Hikaru Gero as shonen anime's newest assassin.
Unlike other assassins, Hikaru Gera's methods are unconventional as he specializes in using different types of poisons to fight and kill at the same time. Hikaru Gero, or simply Gero, came from the Poison Clan, a family of assassins renowned for their deadly expertise. Gero stands as the current heir of the Poison Clan, but has no intention of marrying and bringing another successor to the Poison Clan. Of course, this becomes a serious problem for the current clan head.
Meanwhile, Mei Kinosaki is a marriage con artist, or in other words, a con artist. Mei scams people for money not only because she wants to live a debt-free life, but also to support her brother's hospital expenses. Although Mei and Gero have no previous connection, their paths cross in an unexpected way. So the story of Marriage toxin begins with the fateful meeting of Hikaru and Mei.
Arrange the covers in the correct Japanese release order.
Start
Arrange the covers in the correct Japanese release order.
Easy (5) Medium (7) Hard (10)
Hikaru Gero wants to get married in Marriagetoxin
Mei starts the Prince project for Gero
Initially, Hikaru Gero had no interest in producing the heir of the Poison Clan. He simply cannot imagine getting married and being in love with another person because his life revolved entirely around killing. He didn't have the chance to go to school like normal people, meet normal friends and such because the poisonous clan exposed him to their deadly ways when he was young.
However, after Gero's sister stepped in to produce an heir on his behalf, the assassin later changed his mind about love and romance in general. Also, a conversation with his best friend and fellow assassin Toshiki Hanamaki completely changed Gero's mind. If someone like Toshiki can find love, there may still be hope for Gero to find someone too. This sudden change of heart prompts Gero to find a suitable partner, one who can accept him for who he is.
I can teach you how to attract anyone, men, women, anyone. – Mei Kinosaki to Gero
Enter Mei Kinosaki, a marriage con artist who owes her life to Gero. In return for sparing his life, Mei vows to help Gero in his romantic pursuits and help him in any way she can. From setting up countless women for Gero to improving his social skills, Mei is relentless in guiding him through the unknown world of love and relationships. But it won't be an easy road, as dangerous people threaten to derail their plans.
Bonesfilm brings Marriagetoxin to life
Upcoming anime adaptation Marriage toxin will be produced by Bonesfilm. The studio has been around for quite some time and is known for producing some of the most popular anime such as Gachiakuta and My Hero Academia FINAL SEASONas well as My Hero Academia: Vigilantes.
Fans can look forward to it Marriage toxin with a high level of animation, in addition to the dynamic fight scenes that Bonesfilm is known for. The studio is truly one of the best, so there's no doubt that Marriagetoxin will deliver an impressive first season.
Marriagetoxin Episode 1 is scheduled to release on April 7, 2026
Crunchyroll to premiere Marriagetoxin Episode 1
Release date Marriage toxin episode 1 has already been confirmed. As announced, it will premiere worldwide on April 7, 2026. The exact number of episodes for Marriage toxin has yet to be confirmed, but the series is expected to have around 11 to 13 episodes from April to June 2026.
Crunchyroll has confirmed that they will be streaming Marriage toxin on their platform, with the first episode coming out on April 7, 2026, but the exact release time is still undecided. The streaming giant also announced it Marriage toxin sooner or later they will receive an English dubbed version. The upcoming shonen anime will be available in most international regions, so we recommend checking Crunchyroll availability in your area.
- Network
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Fuji TV, Kansai TV
- directors
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Motonobu Hori
- Writers
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Kimiko Ueno
Cast
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Haruki Ishiya
Hikaru Gero (voice)
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Shion Wakayama
Mei Kinosaki (voice)
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Asaki Yuikawa
Shiori Ureshino (voice)
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Anna Nagase
Kyoko Himekawa (voice)
