Haruki Ishiya
Hikaru Gero (voice)
Series
Watch Marriage Toxin (2026) Online
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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!
Episodes
Season 1
PreviousNext
1. The Poison Master's Search for a BrideNow viewing2026-04-0724m7.0An assassin must marry to appease his clan and save his sister. Small problem: He doesn't know how to date.
2. What Is "Charm," Anyway?2026-04-1424m7.0Kinosaki takes Gero to practice dating in a floating art museum that becomes the scene of a heist.
3. My First2026-04-2124m7.4Gero fights a Water Master to rescue Himekawa, but his real challenge is taking her on a date afterward.
4. The Sound Master2026-04-2824m6.5Gero goes undercover as a student to guard a corporate heiress, but he isn't the only Master on campus.
5. Lord Chladni2026-05-0524m6.3A test of courage seems like a romantic opportunity, but it turns out to be a deadly trap.
6. Together with Me2026-05-1224m6.5Panicked students try to sacrifice Ureshino, and stopping Naruko is the only way to make them see reason.
7. The Bug Master's Wedding2026-05-1924m7.7Gero goes to see his friend get married, only to run into some particularly unwelcome wedding crashers.
8. The Hitman Hunter2026-05-2624m7.5Gero takes a job to protect a fellow Master from a man who can go toe-to-toe with the expert assassins.
9. The Animal Kingdom2026-06-0224m7.0To save Arashiyama, Gero and friends storm into the Beast Clan's home ground.
10. Good-for-Nothing2026-06-0924m7.0Gero and Arashiyama start to bond, but a run-in with their biggest enemy ruins the mood.
11. Offering2026-06-1624m6.2Kinosaki and Piichi sneak into a Beast Clan lab and witness bizarre experiments with blood.
12. Heart and Soul2026-06-2324m6.0To stand a chance against the Beast Master, Gero must get in touch with the essence of his Poison Blood.
13. Thanks, Man2026-06-3024m7.5Arashiyama throws a party to thank Gero, and Kinosaki sets out to make sure it takes a romantic turn.
Cast
Top Billed Cast
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)
Availability
Where To Watch Legally
Crunchyroll
Crunchyroll Amazon Channel
Amazon Video
Apple TV StoreStreaming availability data provided by JustWatch.
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FAQ
Frequently Asked Questions
Is Marriage Toxin available to watch online?
Yes - see the "Where to watch legally" section on this page for streaming, rental and purchase options.
How many seasons does Marriage Toxin have?
Marriage Toxin has 1 season and 13 episodes.
When did Marriage Toxin first air?
Marriage Toxin first aired in 2026.
Is Marriage Toxin still running?
Yes, Marriage Toxin is an ongoing series.
What genre is Marriage Toxin?
Marriage Toxin is classified as Animation, Action & Adventure, Comedy.