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!
RENEWED
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Cast
Haruki Ishiya
Hikaru Gero (voice)
Shion Wakayama
Mei Kinosaki (voice)
Anna Nagase
Kyoko Himekawa (voice)
Mariya Ise
Shizuku Ushio (voice)
Asaki Yuikawa
Shiori Ureshino (voice)
Soma Saito
Genya Naruko (voice)
Hinano Shirahama
Kimie Arashiyama (voice)
Shimba Tsuchiya
Piichi Nakagawa (voice)
Haruka Shiraishi
Akari Gero (voice)
Isamu Yusen
Toshiki Hanamaki (voice)
Seasons & Episodes1 season · 13 episodes
0% complete
E1The Poison Master's Search for a Bride
Apr 7, 202624m★ 7.0
An assassin must marry to appease his clan and save his sister. Small problem: He doesn't know how to date.
E2What Is "Charm," Anyway?
Apr 14, 202624m★ 7.0
Kinosaki takes Gero to practice dating in a floating art museum that becomes the scene of a heist.
E3My First
Apr 21, 202624m★ 7.4
Gero fights a Water Master to rescue Himekawa, but his real challenge is taking her on a date afterward.
E4The Sound Master
Apr 28, 202624m★ 6.5
Gero goes undercover as a student to guard a corporate heiress, but he isn't the only Master on campus.
E5Lord Chladni
May 5, 202624m★ 6.3
A test of courage seems like a romantic opportunity, but it turns out to be a deadly trap.
E6Together with Me
May 12, 202624m★ 6.5
Panicked students try to sacrifice Ureshino, and stopping Naruko is the only way to make them see reason.
E7The Bug Master's Wedding
May 19, 202624m★ 7.7
Gero goes to see his friend get married, only to run into some particularly unwelcome wedding crashers.
E8The Hitman Hunter
May 26, 202624m★ 7.5
Gero takes a job to protect a fellow Master from a man who can go toe-to-toe with the expert assassins.
E9The Animal Kingdom
Jun 2, 202624m★ 7.0
To save Arashiyama, Gero and friends storm into the Beast Clan's home ground.
E10Good-for-Nothing
Jun 9, 202624m★ 7.0
Gero and Arashiyama start to bond, but a run-in with their biggest enemy ruins the mood.
E11Offering
Jun 16, 202624m★ 6.2
Kinosaki and Piichi sneak into a Beast Clan lab and witness bizarre experiments with blood.
E12Heart and Soul
Jun 23, 202624m★ 6.0
To stand a chance against the Beast Master, Gero must get in touch with the essence of his Poison Blood.
E13Thanks, Man
Jun 30, 202624m
Arashiyama throws a party to thank Gero, and Kinosaki sets out to make sure it takes a romantic turn.
About Marriage Toxin
Marriage Toxin is a animation, action & adventure, comedy series on Fuji TV. The show first aired on Apr 7, 2026 and currently has 1 season and 13 episodes. Marriage Toxin has been renewed and is returning for more episodes. It has a rating of 7.5/10 based on 46 votes. The cast includes Haruki Ishiya, Shion Wakayama, Anna Nagase, Mariya Ise, Asaki Yuikawa.
