With so many highly anticipated titles lined up for Crunchyroll’s Spring 2026 season, it’s understandable why MARRIAGETOXIN may be overlooked… but oh, what a shame that is! This anime is one of the most absurd, yet ridiculously entertaining adaptations I’ve watched in a very long time.
Minor spoilers for episodes 1-3
The Five Great Families of the criminal underworld have passed down their deadly art for centuries.
Hikaru Gero, descending from the Poison Masters, possesses their fearsome power as a poison user and wields influence as a top-class assassin.
When Gero’s younger sister Akari is forced to leave her girlfriend to fulfill the clan’s wishes of producing an heir at the behest of their grandmother, Gero steps in to preserve his sister’s freedom and does something far more terrifying than killing: finding love. It’s then that Gero meets Mei Kinosaki, a marriage swindler whom he’ll spare under one condition: “If you agree to marry me, I promise to get you out of here.” Mei’s response? “There’s not a chance in hell I would marry you.”
Realizing that Mei’s talents may be the answer to his problems, he spares her life under new conditions. And so marks the beginning of the unlikely duo’s journey to finding Gero’s happily ever after before he becomes the next head of the clan.
“I can make anyone fall for you regardless of gender.”
Even if Mei had agreed to marry Gero, there’d be one big hiccup… Mei is a cross-dressing scammer.
But Mei’s pretty confident in his abilities, and with a track record so strong it landed him on Gero’s hit list, Gero doesn’t mind his gender. It’s too bad Mei can’t give him an heir…
From the beginning, the show fully commits to the absurd. Comedy and violence coexist as if that were the natural way of the world. We’re immediately thrown into the swing of things by a mob boss who proudly declares his organization’s motto is “providing human touch” while snuffing out cigarettes on a hunk of a human chair.
We’re then segued into Gero’s personal life when we meet the Bug Master. Although Gero doesn’t address him by name, they’re supposedly best buds (because besties aren’t supposed to know each other’s names). The Bug Master announces his marriage and almost immediately glides off on his pet centipedes as if they were a substitute for Heelys.
And not too long after teaming up with Mei, all types of goofy NPCs try to take our man down. In the second episode, a duo that resembled Tweedledee and Tweedledum, and a security detail that looked like they just finished a shift at Doug Dimmadome’s Dimmsdale Dimmadome (iykyk), were swiftly reminded why they’re mere underlings.
When I readjusted my eyes after having them closed from laughing so hard, I came to realize how painfully relatable and unexpectedly heartfelt Gero’s sentiments toward love felt.
Throughout his training with Mei, we see just how objectively terrible Gero is at dating. He’s paranoid about food he didn’t prepare himself, incapable of casual conversation, and physically unable to smile like a normal person. But at the same time, he’s lowkey husband material? Although triggered by nervousness, his cleaning habits are impeccable. Although rooted in control issues, he has an affinity for DIY food kits. And there are moments throughout MARRIAGETOXIN where he’s giving chemist (beauty and brains)… Did I mention he’s a romantic at heart?
There’s potential here, it’s just buried under years of emotional isolation and assassin training. We see some of Gero’s trauma through brief flashbacks, such as him eating alone as a child while training to become the perfect weapon. Gero’s view of love is simple—childlike. He believes in it completely, despite never having experienced it.
Gero’s sincerity contrasts heavily with Mei’s performative approach to romance, creating a dynamic where both characters have something to learn from each other.
When Mei’s “Operation White Knight” kicks off, the structure of Gero’s romantic journey becomes clearer. Instead of forcing him into dating simulations and awkward scenarios, Mei plays to his strengths. If Gero can’t charm potential partners, he can at least save them! Heroism, after all, is attractive. It’s ridiculous in the best way, and somehow still grounded in recognizable dating rules, like creating a connection by making a strong first impression and building trust through actions.
I won’t give any more details from there, because seriously—you’ve got to experience this show for yourself.
I will personally take this moment to declare that, through everything I’ve seen so far… Gero and Mei’s dynamic is what’s got me hooked.
One kills for a living, and the other manipulates people into fake marriages. They couldn’t be more opposite from each other, yet they meet in the middle in interactions filled with chemistry, tension, and just enough vulnerability to make you question whether this “arrangement” will stay strictly professional for long. They’ve created an environment where they have no choice but to inevitably understand each other. And that’s where love blooms, hehe…
On the production side, the soundtrack stands out to me. The opening theme, “Kill or Kiss” by Yurina Hirate, is incredibly catchy and captures the fun atmosphere of the series perfectly, making it an easy no-skip intro every time. The ending theme, “Shake Na Baby” by AKASAKI, also fits well, closing out each episode on an upbeat, playful note.
Bones is responsible for the MARRIAGETOXIN adaptation. This is a studio known for elevating action-heavy stories with strong character animation, and while MARRIAGETOXIN may not be their most ambitious project, it’s in very capable hands. If it proves to be a success—which I’m sure it will—then it can only go up from here. And this is a pretty solid start.
There are a few moments where the pacing feels slightly awkward, but it rarely detracts from the overall experience.
If anything, this is the kind of show that benefits from not being overanalyzed in the moment. It’s best when you let yourself get swept up in the humor and the surprisingly sincere emotional undercurrent.
When it’s time to lock in, the animators know exactly how to frame Gero at his coolest. His “go mode” moments, where his assassin instincts take over, are slick and incredibly satisfying to watch. It’s a reminder that beneath all the anxiety, he’s genuinely dangerous.
You’ve heard of the “Dark Trio” (Jujutsu Kaisen, Chainsaw Man, and Hell’s Paradise), now get ready for what I like to call the “Emotionally Available Assassins Club.” Taro Sakamoto (Sakamoto Days) and Loid Forger (Spy x Family) walked so Hikaru Gero could run. This holy trinity puts the ass in assassin, and I absolutely adore them for it.
I came for the laughs, got caught up in the action, and somehow ended up fully invested in the relationships—especially one in particular. I, and anybody else watching MARRIAGETOXIN, would be a fool to ignore the obvious: Gero doesn’t need a bride. He needs a husband.
With that being said, we will be tuning in to see how MARRIAGETOXIN plays out! I’m dying to meet grandma.
My rating: 3.5 out of 5 stars!
Pros
- Constant comedy
- Strong, believable chemistry between characters. Action sequences build hype for the MC.
- Great voice acting (I enjoyed both sub and dub).
- Older audiences will enjoy the age-appropriate romance.
Cons
- Slightly awkward pacing
MARRIAGETOXIN is an ongoing manga series written by Joumyaku and illustrated by Mizuki Yoda. It began serialization in Shueisha’s Shōnen Jump+ platform in April 2022. The official English translation is available on MANGA Plus and is licensed by VIZ Media.
