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Exploring the Upcoming Marriage Toxin Anime: Cast, Crew, and Unique Storyline
This spring, anime enthusiasts are set to experience a thrilling series that merges the world of assassins and romance swindlers. Shueisha has unveiled an exciting trailer and a captivating key visual for the much-anticipated anime adaptation of Jōmyaku and Mizuki Yoda’s Marriage Toxin manga. Here’s everything you need to know about this upcoming series.
New Cast Members Unveiled
The cast of Marriage Toxin brings together an array of talented voice actors, each bringing their unique flair to their roles:
- Anna Nagase as Kyoko Himekawa: Kyoko is dedicated to retrieving art that has been unjustly acquired and restoring it to its rightful owners.

- Mariya Ise as Shizuku Ushio: A formidable businesswoman in the underworld and a master of water.

- Asaki Yuikawa as Shiori Ureshino: Heir to a massive party supply company valued at 1.5 trillion yen.

- Sōma Saitō as Genya Naruko: Descendant of the Sound Master lineage, with a distinctive aura.

- Hinano Shirahama as Kimie Arashiyama: From the Beast Master lineage, with a specialization in hamsters.

- Simba Tsuchiya as Piichi Nakagawa: An ordinary human with extraordinary genetic capabilities.

Additional roles include Haruka Shiraishi as Akari Gero and Isamu Yūsen as Toshiki Hanamaki.
Talented Staff Behind The Scenes
The production of Marriage Toxin boasts a team of renowned professionals:
- Director: Motonobu Hori (Carole & Tuesday)
- Script and Series Composition: Kimiko Ueno (Astro Note)
- Character Design and Chief Animation Director: Kōhei Tokuoka (The Fragrant Flower Blooms With Dignity)
- Music Composers: Taisei Iwasaki (BELLE), Yuma Yamaguchi (Metallic Rouge)
The series will benefit from the meticulous attention to detail in costume design, prop design, and editing, making it a visual treat.
A Unique Storyline: Love and Assassins
At its core, Marriage Toxin is a riveting tale of family, love, and unexpected partnerships. Set in a world ruled by the Masters’ deadly arts, the anime follows Hikaru Gero, heir to the powerful Poison Masters’ Gero family. As his sister faces pressure to bear an heir, Hikaru must intervene by enlisting the help of Mei Kinosaki, a savvy marriage swindler. Together, they embark on a complex mission to secure a bride for Hikaru, blending strategic matchmaking with thrilling action.
Ultimately, Marriage Toxin presents a unique take on the themes of love and responsibility, all wrapped up in the excitement of espionage and assassination.
The Manga’s Journey
The manga, which first captivated audiences on the Shonen Jump+ app in April 2022, continues to gain popularity. With Viz Media’s licensing and its English availability on Shueisha’s MANGA Plus app, it’s easier than ever for international fans to engage with this captivating story.

Final Thoughts
Marriage Toxin promises to be an anime that challenges conventions while providing an engaging narrative arc filled with intriguing characters. The combination of renowned staff, skilled voice actors, and a compelling storyline ensures that this anime will be on many must-watch lists when it premieres in April 2026.
For those who enjoy an intricate blend of romance and action, Marriage Toxin offers a narrative that’s not only entertaining but thought-provoking. As the series draws nearer, anticipation and excitement build, marking it as one of the standout anime series to look forward to.
Explore similar captivating anime narratives by visiting MyAnimeList and expand your library with unique stories.


