Episode 1
The Poison Master's Search for a Bride
24m7.2 / 10
An assassin must marry to appease his clan and save his sister. Small problem: He doesn't know how to date.
Episode credits
Directed by Motonobu HoriWritten by Kimiko Ueno
TV series
Marriage Toxin
2026TV-141 season7.9 / 10
For centuries, the deadly arts have been perfected by Masters, and Five Great Families hold the greatest power and influence. Hikaru Gero, an heir to the Gero family, lives in the underworld as an elite assassin. When his sister is pressured to produce an heir, Hikaru asks Mei Kinosaki, a brilliant marriage swindler, to find him a bride. The most challenging mission of his life begins!
Streaming, rental and purchase options
Where to watch in United States
Checked Jul 22, 2026
Marriage Toxin is available to stream on Crunchyroll Premium (Via Amazon Prime) and YouTube TV in United States. You can also buy it from Amazon and Apple TV. Use the direct links below to open the provider.
Synopsis
For centuries, the deadly arts have been perfected by Masters, and Five Great Families hold the greatest power and influence. Hikaru Gero, an heir to the Gero family, lives in the underworld as an elite assassin. When his sister is pressured to produce an heir, Hikaru asks Mei Kinosaki, a brilliant marriage swindler, to find him a bride. The most challenging mission of his life begins!
Season 1 episodes
Choose an episode, then use the watch options above for the show.
Where to watch Marriage Toxin
Episode 2
What Is "Charm," Anyway?
24m7.0 / 10
Kinosaki takes Gero to practice dating in a floating art museum that becomes the scene of a heist.
Where to watch Marriage Toxin
Episode 3
My First
24m7.4 / 10
Gero fights a Water Master to rescue Himekawa, but his real challenge is taking her on a date afterward.
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Episode 4
The Sound Master
24m6.6 / 10
Gero goes undercover as a student to guard a corporate heiress, but he isn't the only Master on campus.
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Episode 5
Lord Chladni
24m6.6 / 10
A test of courage seems like a romantic opportunity, but it turns out to be a deadly trap.
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Episode 6
Together with Me
24m6.5 / 10
Panicked students try to sacrifice Ureshino, and stopping Naruko is the only way to make them see reason.
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Episode 7
The Bug Master's Wedding
24m7.7 / 10
Gero goes to see his friend get married, only to run into some particularly unwelcome wedding crashers.
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Episode 8
The Hitman Hunter
24m7.5 / 10
Gero takes a job to protect a fellow Master from a man who can go toe-to-toe with the expert assassins.
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Episode 9
The Animal Kingdom
24m7.0 / 10
To save Arashiyama, Gero and friends storm into the Beast Clan's home ground.
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Episode 10
Good-for-Nothing
24m7.0 / 10
Gero and Arashiyama start to bond, but a run-in with their biggest enemy ruins the mood.
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Episode 11
Offering
24m6.2 / 10
Kinosaki and Piichi sneak into a Beast Clan lab and witness bizarre experiments with blood.
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Episode 12
Heart and Soul
24m6.0 / 10
To stand a chance against the Beast Master, Gero must get in touch with the essence of his Poison Blood.
Episode credits
Directed by Yuka HashimotoWritten by Kimiko Ueno
Episode 13
Thanks, Man
24m7.5 / 10finale
Arashiyama throws a party to thank Gero, and Kinosaki sets out to make sure it takes a romantic turn.
Where to watch Marriage ToxinEpisode information updated Jul 23, 2026
More about Marriage Toxin
Cast
Haruki IshiyaHikaru Gero (voice)
Shion WakayamaMei Kinosaki (voice)
Anna NagaseKyoko Himekawa (voice)
Mariya IseShizuku Ushio (voice)
Asaki YuikawaShiori Ureshino (voice)
Soma SaitoGenya Naruko (voice)
Hinano ShirahamaKimie Arashiyama (voice)
Shimba TsuchiyaPiichi Nakagawa (voice)Credits
- Written by
- Kimiko Ueno
Production details
- Status
- Returning Series
- Series type
- Scripted
- Episodes
- 13
- Original language
- Japanese
- Original title
- マリッジトキシン
Networks & production
Fuji TVJapan
Tokai Television BroadcastingJapan
Kansai TVJapan
Fukui TVJapan
Hokkaido Cultural BroadcastingJapan
Iwate Menkoi TelevisionJapan
Themes
animeassassinbased on mangagenderqueerlesbianlgbtromanceshounen
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