by The upcoming TV anime Marriage Toxin has announced its official opening theme song. The track, titled “Kill or Kiss,” will be performed by Japanese actress and singer Yurina Hirate.
The anime is scheduled to premiere on April 7, 2026, airing every Tuesday at 11:00 PM on Kansai TV and Fuji TV as part of the nationwide “Tuesday Anime Festival!” programming block.
Along with the theme song announcement, a special behind-the-scenes documentary video titled “Making of Marriage Toxin” has also been released, giving fans a glimpse into the anime’s production process.
A Unique Anime Combining Action and Romance
The anime is based on the manga Marriage Toxin, written by Junkyo and illustrated by Mizuki Yoda.
The series is serialized on Shonen Jump+, the digital manga platform operated by Shueisha.
Unlike traditional romance stories, Marriage Toxin blends marriage-hunting comedy with intense assassin action, creating a unique genre mix that has attracted a growing fanbase.
Story Overview: The World’s Toughest Marriage Mission
The story follows Gero Hikaru, a young assassin from a legendary clan known as the “Poison Users.”
His family has maintained their deadly profession for centuries. However, the clan now faces an unexpected crisis: their bloodline is in danger of ending.
To save the family lineage, Hikaru is ordered to do something he has never considered before—get married.
Completely inexperienced in romance, he seeks help from a mysterious professional marriage swindler named Mei Shirosaki.
Together, the unlikely duo navigates the chaotic world of modern dating while dealing with rival assassins and dangerous enemies.
The anime promises a mix of:
High-speed action scenes
Romantic comedy moments
Colorful supporting characters
Suspenseful battles between elite assassins
Voice Cast Bringing the Characters to Life
The anime features a talented voice cast.
Main Characters
Haruki Ishitani as Gero Hikaru
Shion Wakayama as Mei Shirosaki
Their performances highlight the contrast between Hikaru’s serious assassin personality and Mei’s cunning yet playful approach to matchmaking.
Opening Theme Song: “Kill or Kiss”
The anime’s opening theme song “Kill or Kiss” will be performed by Yurina Hirate, who is known for her powerful stage presence and emotional vocal style.
The song combines sharp beats and mysterious synth sounds, creating a dramatic atmosphere that reflects the story’s blend of romance and danger.
According to Hirate, the song captures the conflicting emotions that define the anime.
Song Characteristics
Fast-paced dance rhythm
Dark electronic soundscape
Lyrics expressing love and danger
A mood balancing sweetness and poison
This unique musical style perfectly matches the tone of Marriage Toxin, where romance and lethal battles coexist.
Yurina Hirate’s Comment About the Song
Yurina Hirate shared her thoughts on performing the opening theme:
“While recording ‘Kill or Kiss,’ I imagined the world of Marriage Toxin and the relationship between the two main characters. It’s a dance track with sharp beats and mysterious synth sounds. The song expresses the impulses where sweetness and poison intertwine. I personally love this song and hope fans of the original manga will enjoy it as well.”
She also expressed excitement about watching the anime alongside fans once it begins airing.
Behind-the-Scenes Production Video Released
To celebrate the upcoming premiere, the production team released a documentary video titled “Making of Marriage Toxin.”
The video features interviews with staff from Bones Film, the studio responsible for the anime adaptation.
What the Making-Of Video Shows
Character design development
Animation techniques used in action scenes
Storyboarding and direction processes
Insights from animation staff
The first video, “Making of Marriage Toxin Vol. 0,” introduces the different departments involved in producing the series.
The documentary series will be released in six parts, offering fans a deeper look into how the anime is created.
Why Marriage Toxin Is One of 2026’s Most Anticipated Anime
The anime has already attracted attention for several reasons:
Unique Genre Mix
Combining romantic comedy with assassin action is rare in anime.
Popular Manga Source
The original manga on Shonen Jump+ has gained a strong readership.
Experienced Studio
Bones Film is known for producing visually impressive anime with dynamic action scenes.
Memorable Theme Song
Yurina Hirate’s opening theme adds a distinctive musical identity to the series.
Final Thoughts
With its unusual premise, energetic action, and catchy opening theme song, Marriage Toxin is shaping up to be one of the standout anime of the Spring 2026 season.
The release of the theme song “Kill or Kiss” and the behind-the-scenes production video has only increased excitement among fans.
As the premiere date approaches, viewers can look forward to a series that blends romance, comedy, and high-stakes battles into one thrilling anime experience.
