Marriage Toxin anime just released its first promo video, showcasing how Joumyaku and Mizuki Yoda's unique hitman-meets-matchmaker story will be translated into an animated series. Studio Bones Film has given us a first look at what may be one of Spring 2026's most unique dual-genre action comedies.The Marriage Toxin anime will have its premiere in April 2026 and will be directed by Motonobu Hori. The story revolves around an elite assassin who is on a desperate quest to find a bride for himself to save his sister from a gruesome family ultimatum.Hikaru Gero, the protagonist of the series (Image Source: Bones Film)The newly released promotional video provides viewers with their initial look at the anime's visual style and tone. The trailer shows Gero using his deadly poison weapons as he hunts down Kinosaki, who ends up being an ally instead of a target. There are awesome fight scenes showing how good Gero is at killing people, and we will also get to meet other important characters that will make Gero's quest to find a wife more challenging.The creative studio that does Marriage Toxin is Studio Bones Film. The project is directed by Motonobu Hori (past directing experience: Carole & Tuesday, etc.). Series composition and scriptwriting were created by Kimiko Ueno. The character design and chief animation director is Kohei Tokuoka.Plot of Marriage ToxinMei Kinosaki as seen in the PV (Image Source: Bones Film)Marriage Toxin is a series about Hikaru Gero, who is the heir of the Poison Masters Gero Family from the Five Great Families. He has never really been on the scene romantically because his entire life has been spent in the underworld, and he doesn't know how to talk to people at all.When his family wants him to have kids to continue their bloodline, they even threaten to make his sister have kids. So he sets out on a mission to find his own bride to keep his sister safe.Gero, who is on a job, runs across Mei Kinosaki, a crazy-good marriage con artist who can get anybody to fall in love in seconds. And when Gero learns how good Kinosaki is at what she does, he just can't help himself and asks Kinosaki to help him find a wife. This unusual request launches the pair into what the series describes as the world's toughest marriage mission.Voice cast of Marriage Toxin AnimeKimie Arashiyama, the Hamster Master (Image Source: Bones Film)Haruki Ishiya voices protagonist Hikaru Gero in the Marriage Toxin anime. The talented voice actress Shion Wakayama plays Mei Kinosaki, a crafty crook and master manipulator with a charming personality. The recently announced supporting cast includes Anna Nagase as Kyoko Himekawa, an art recovery specialist with a passion for sharks. Asaki Yuikawa, who will be voicing Shiori Ureshino, a university student who is also an heir to a massive party supply corporation. Hinano Shirahama will be playing Kimie Arashiyama, a Hamster Master searching for her lost brother.Mariya Ise is gonna play the character Shizuku Ushio from a businessman's perspective. Soma Saito will play Genya Naruko, who comes from a long line of Sound Masters, and Simba Tsuchiya will play Piichi Nakagawa.April 2026 premiere window confirmedThe Marriage Toxin anime is set to premiere in Japan in the April 2026 anime season. Even though there is no information on where fans outside of Japan will be able to find this series yet, the creators are doing their best to make a great adaptation of it.The premiere date of April places the show at a great time for the annual spring anime season, when there will be many other huge-name shows being released. Fans should keep up to date with the official channels and social media for news about the development and release dates for this series.