Marriage Toxin

About Marriage Toxin

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.

Marriage Toxin is an action-adventure, animation, and comedy series that airs on Fuji TV and Tokai Television Broadcasting. Since April 2026 it has reached 2 seasons and 13 episodes.

Its themes are assassin, lesbian, bewildered, and genderqueer. The story is adapted from a manga. Haruki Ishiya appears as Hikaru Gero (voice), Shion Wakayama as Mei Kinosaki (voice), Anna Nagase as Kyoko Himekawa (voice), and Mariya Ise as Shizuku Ushio (voice).

It was produced by Bandai Namco Filmworks, BONES, and BONES Film. American members can watch it on Crunchyroll and Crunchyroll Amazon Channel.

Horimiya, Bloom Into You, and Dealing with Mikadono Sisters Is a Breeze make useful companions to Marriage Toxin, all filed under amused, romance, and based on manga. TMDB voters put it at 7.4 out of 10 across 53 votes and it carries a TV-14 rating.