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Playback is currently unavailable for S1 E1 · The Poison Master's Search for a Bride. Episode details remain available below.

Poster for Marriage Toxin

Marriage Toxin

7.4/10 54 votes
AnimationAction & AdventureComedy

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!

Cast:
Haruki Ishiya, Shion Wakayama, Anna Nagase, Mariya Ise
Language:
Japanese
Country:
Japan
Network:
Fuji TV, Tokai Television Broadcasting, Kansai TV, Fukui TV, Hokkaido Cultural Broadcasting, Iwate Menkoi Television, Sendai Television, SAGA TV, Ishikawa TV, TNC, OHK, Kochi Sun Sun Broadcasting, Television Shin Hiroshima System, TV Shizuoka, NST, NBS, Sakuranbo TV, TSK, Ehime Broadcasting, KTS, Fukushima TV, AKT, Toyama Television, TV Kumamoto, Okinawa Television Broadcasting, KTN

Episode guide

Seasons

2 available

Season 1

Episodes

Episode 1 selected
Still from The Poison Master's Search for a Bride E01

Episode 1

★ 7.0

The Poison Master's Search for a Bride

2026-04-07 · 24m

An assassin must marry to appease his clan and save his sister. Small problem: He doesn't know how to date.

Current episode
Still from What Is "Charm," Anyway? E02

Episode 2

★ 7.0

What Is "Charm," Anyway?

2026-04-14 · 24m

Kinosaki takes Gero to practice dating in a floating art museum that becomes the scene of a heist.

Watch progress · Not tracked
Still from My First E03

Episode 3

★ 7.4

My First

2026-04-21 · 24m

Gero fights a Water Master to rescue Himekawa, but his real challenge is taking her on a date afterward.

Watch progress · Not tracked
Still from The Sound Master E04

Episode 4

★ 6.5

The Sound Master

2026-04-28 · 24m

Gero goes undercover as a student to guard a corporate heiress, but he isn't the only Master on campus.

Watch progress · Not tracked
Still from Lord Chladni E05

Episode 5

★ 6.2

Lord Chladni

2026-05-05 · 24m

A test of courage seems like a romantic opportunity, but it turns out to be a deadly trap.

Watch progress · Not tracked
Still from Together with Me E06

Episode 6

★ 6.5

Together with Me

2026-05-12 · 24m

Panicked students try to sacrifice Ureshino, and stopping Naruko is the only way to make them see reason.

Watch progress · Not tracked
Still from The Bug Master's Wedding E07

Episode 7

★ 7.7

The Bug Master's Wedding

2026-05-19 · 24m

Gero goes to see his friend get married, only to run into some particularly unwelcome wedding crashers.

Watch progress · Not tracked
Still from The Hitman Hunter E08

Episode 8

★ 7.5

The Hitman Hunter

2026-05-26 · 24m

Gero takes a job to protect a fellow Master from a man who can go toe-to-toe with the expert assassins.

Watch progress · Not tracked
Still from The Animal Kingdom E09

Episode 9

★ 7.0

The Animal Kingdom

2026-06-02 · 24m

To save Arashiyama, Gero and friends storm into the Beast Clan's home ground.

Watch progress · Not tracked
Still from Good-for-Nothing E10

Episode 10

★ 7.0

Good-for-Nothing

2026-06-09 · 24m

Gero and Arashiyama start to bond, but a run-in with their biggest enemy ruins the mood.

Watch progress · Not tracked
Still from Offering E11

Episode 11

★ 6.2

Offering

2026-06-16 · 24m

Kinosaki and Piichi sneak into a Beast Clan lab and witness bizarre experiments with blood.

Watch progress · Not tracked
Still from Heart and Soul E12

Episode 12

★ 6.0

Heart and Soul

2026-06-23 · 24m

To stand a chance against the Beast Master, Gero must get in touch with the essence of his Poison Blood.

Watch progress · Not tracked
Still from Thanks, Man E13

Episode 13

★ 7.5

Thanks, Man

2026-06-30 · 24m

Arashiyama throws a party to thank Gero, and Kinosaki sets out to make sure it takes a romantic turn.

Watch progress · Not tracked

Cast

Haruki Ishiya

Haruki Ishiya

Hikaru Gero (voice)

Shion Wakayama

Shion Wakayama

Mei Kinosaki (voice)

Anna Nagase

Anna Nagase

Kyoko Himekawa (voice)

Mariya Ise

Mariya Ise

Shizuku Ushio (voice)

Asaki Yuikawa

Asaki Yuikawa

Shiori Ureshino (voice)

Soma Saito

Soma Saito

Genya Naruko (voice)

Hinano Shirahama

Hinano Shirahama

Kimie Arashiyama (voice)

Shimba Tsuchiya

Shimba Tsuchiya

Piichi Nakagawa (voice)

Haruka Shiraishi

Haruka Shiraishi

Akari Gero (voice)

Isamu Yusen

Isamu Yusen

Toshiki Hanamaki (voice)

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