Marriage Toxin - Season 1 (2026)

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

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

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

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

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

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

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

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

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

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

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

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

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