Marriage Toxin Anime — Poison, Pranks, and an Unlikely Quest for Love
If you’ve been enjoying manga rabbit holes lately, Marriagetoxin is the one people are suddenly buzzing about and for good reason. The hit action-romcom from Joumyaku and Mizuki Yoda just got an official TV anime greenlight for 2026. That means more poison jokes, awkward dating lessons, and the best kind of “will-he-ever-get-it-together?” chaos coming soon to animation.
At its core the manga is a deliciously odd mix of action, rom-com, and screwball training montage: Hikaru Gero is the heir to a centuries old Poison Masters clan, a clan that expects an heir to continue the line. Gero, however, is an assassin who thinks marriage isn’t for him… until his sister’s fate is threatened and he’s forced to find a bride. Enter Mei Kinosaki, a professional marriage swindler who ends up training Gero on dating, social cues, and how to not be terrifying on a first date. It’s equal parts “teach the killer to flirt” and “rom-com with a poison-tipped punchline.” The manga has been serialized on Shōnen Jump+ since April 2022 and is licensed in English by Viz Media. This adaptation isn’t being handed to some random studio. The animation is being handled by BONES Film, with Motonobu Hori directing and Kimiko Ueno on series composition. Character design and chief animation direction roles are in experienced hands, and the music team includes composers Taisei Iwasaki and Yuma Yamaguchi. On the seiyū side, the principal roles were announced with Haruki Ishiya and Shion Wakayama among the leads. That staffing signals production values and tonal care — Bones’ résumé and the named staff suggest the studio wants to balance action chops with rom-com timing.
There are two reasons for the hype: novelty and quality. The premise a poison-clan assassin being coached out of his social entropy is a fresh rom-com angle that stands out from school-life or isekai tropes. Pair that with a studio like Bones and a clear, professional staff and you get legit excitement. The cautious part? Fans always worry about pacing and how much of the manga a single season will cover; many manga readers will be watching for adaptation fidelity and whether the comedy lands in animation the same way it does on the page.
Yes, with reasonable expectations. Marriagetoxin blends an off-kilter premise with sharp gag timing and surprisingly sincere character moments. With BONES Film and the announced staff attached, the anime has the creative horsepower to do the manga justice, especially if it keeps the balance between quick-action beats and the rom-com heart. Whether you come for the poison jokes or stay for the character growth, this is one of those adaptations that feels like a perfect “why not?” pick for 2026 anime season-watch lists.
Image Credit BONES Film
