Marriagetoxin

マリッジトキシン

7.2(1)

OtakuDen

7.6(56,494)

MAL Score

Ranked #1862

Popularity #1717

Action
Comedy
Adult Cast

Episodes: 13
Duration: 23 min per ep
Aired: Apr 7, 2026 to Jun 30, 2026
Status: Finished Airing

Synopsis

In a world where the art of assassination is mastered by a select few, the Gero family reigns among the elite Poison Masters, renowned for their lethal skills and influence. Hikaru Gero, the reluctant heir to this shadowy legacy, has always avoided the entanglements of love and commitment, living instead within the dark corridors of his family's power. However, when his sister's future is jeopardized by the family's pressing need for an heir, the stakes suddenly rise.

Enter Mei Kinosaki, a clever con artist with a talent for duping those seeking romance. Ironically, she also finds herself on Hikaru's list as a target. In a surprising twist of fate, Hikaru proposes an unconventional alliance: to assist him in navigating the complexities of marriage. With Mei's cunning strategies and Hikaru's lethal skills, they embark on an unexpected journey that intertwines romance and danger, challenging the very essence of their identities. Together, this unlikely pair must confront not only external threats but also their own evolving feelings as they strive for the ultimate union.

Otaku Consensus

Marriagetoxin lands as a sharply tuned genre cocktail rather than a prestige action showcase: Motonobu Hori’s direction and Kimiko Ueno’s series composition keep the 13-episode run moving, with viewers repeatedly singling out its genuinely funny beats, decent fight scenes, and steady progression. Its sticking point is polish: detractors call the story lightweight and the presentation uneven, with animation and especially soundtrack impressions trailing behind the comedy and character chemistry.

Why You Should Watch

Watch Marriagetoxin if you want underworld romance-comedy that treats adult messiness as the engine, not a side dish. Its sweet spot is viewers who like assassination lore, urban crime, queer-flavored relationship games, and super-powered fights, but do not want grim-dark self-importance or a slow-burn that forgets to joke. The appeal is less “who wins the duel?” than watching a professional killer and a professional liar turn courtship into tactics, with Bones Film keeping the action readable and the gags quick. It scratches the same itch as Spy x Family’s domestic-crime absurdity and The Fable’s hitman deadpan, while leaning more openly into marriage pressure, bisexual/LGBTQ+ themes, and surreal comedy. At 13 episodes, it is compact enough to binge yet structured enough to show real progression.

Key Characters

H
Hikaru Gero(VA: Haruki Ishiya)
Hikaru is the kind of shounen-action lead whose intimidation factor keeps colliding with romantic inexperience, making his lethal competence funnier than simple power fantasy.
M
Mei Kinosaki(VA: Shion Wakayama)
Mei is the series’ pressure point: a romance-scam specialist whose verbal agility turns dates, schemes, and negotiations into the show’s sharpest comedy.

What Makes It Stand Out

1
Bones Film produced the 13-episode TV run, which aired from April 7 to June 30, 2026. The compact season format matches the reception pattern: viewers praised the show more for momentum and progression than for sprawling world-building.
2
Its AniList tag profile is unusually specific for an action-comedy: Assassins at 97%, Marriage at 94%, Crime and Urban at 90%, and Surreal Comedy at 89%. That combination explains why the series plays less like a standard battle show and more like an underworld sitcom with weapons drawn.
3
The staff list shows a design-heavy production pipeline, with Kouhei Tokuoka on character design, Yurika Sako on sub-character design, Ryou Hirata and Ayumi Nagaki on prop design, Kotono on costume design, and Toshiki Amata on art design. For a show built around adult criminals, romance setups, weapons, and disguises, those credits are not ornamental.
4
The relationship material is not framed as a simple heterosexual gag machine: AniList marks Bisexual at 81%, LGBTQ+ Themes at 70%, and Heterosexual at 69%. That tag mix is a useful signal for viewers looking for romantic chaos with more identity texture than the usual shounen pairing lane.
5
Critical chatter repeatedly pushed back against calling it pure “action slop.” The common positive notes were humor, decent fight scenes, and solid episode-to-episode progression, while the loudest negatives targeted thin story ambitions and inconsistent audiovisual impact.

Fun Facts & Trivia

Fun fact 1: The original creative credits are split between Joumyaku for the story and Mizuki Yoda for original character design, a distinction preserved in the anime’s staff listing rather than folded into a single creator credit.
Fun fact 2: Kimiko Ueno handled series composition, placing the show’s tonal balancing act—crime, romance, action, and surreal comedy—under a writer credited at the structural level rather than only at individual episodes.
Fun fact 3: Its audience numbers point to a mid-tier hit rather than a niche curiosity: MyAnimeList lists a 7.6 score from 36,633 votes, rank #1769, and popularity #1933, while AniList reports 76/100 with 1,455 favourites.
Fun fact 4: Online reactions were notably split in tone: one review scored it 4.6 overall with especially low soundtrack marks, while other comments opened with “Damn, this is good,” praised the funny moments, and called it enjoyable even if not anime of the year.
Fun fact 5: The credited main cast in the provided data is tightly focused on just two leads: Haruki Ishiya as Hikaru Gero and Shion Wakayama as Mei Kinosaki, reinforcing how much of the anime’s appeal rests on their dynamic rather than a large ensemble.