Jōmyaku

Jōmyaku is a Japanese manga writer (gensakusha) best known as the creator and writer of Marriagetoxin, a series that launched on Shueisha's Shōnen Jump+ in April 2022. The series, illustrated by Mizuki Yoda, blends action, romantic comedy, and family drama around a poison-using assassin who hires a marriage swindler. As of 2026, Marriagetoxin has run for over 100 chapters, been collected into 15 tankōbon volumes, and received an anime adaptation. Jōmyaku's writing is noted for its sharp twists and morally complex characters, earning a loyal readership on both Shōnen Jump+ and the international Manga Plus platform.

What sets Jōmyaku apart is the deeply personal foundation of their work. In interviews, they have cited the death of their father and the strong personality of their grandmother as direct influences on the series' themes of duty, lineage, and arranged marriages within assassin clans. That personal touch, filtered through a genre-savvy narrative, gives the story a weight that resonates beyond its pulpy premise. [edit]

Jōmyaku grew up as the eldest son in a Japanese household. Their father worked as a government employee, and their grandmother was a commanding, boss-like figure who left a lasting impression. When their father passed away, Jōmyaku was told they would need to take over the household, a moment they later described as deeply impactful, especially since they had never thought of family in those terms before.

Before breaking into serialization, Jōmyaku wrote one-shot stories in 2021 that tested the concepts later refined into Marriagetoxin. These early drafts already mixed assassin clans with romantic comedy, establishing the core DNA of the series. The crucial step came when Jōmyaku partnered with illustrator Mizuki Yoda. Yoda's ability to translate Jōmyaku's written ideas into vivid, explosive artwork created a creative synergy that Jōmyaku has described as friction-free, Yoda never questioned even the wildest ideas, instead amplifying them on the page. [edit]

Marriagetoxin debuted on Shōnen Jump+ on April 20, 2022, and quickly found an audience. The series follows Gero Hikaru, a young assassin from a poison-using clan, who enlists the help of a marriage swindler named Mei Kinosaki to find a wife and produce an heir, sparing his sister from a forced marriage. The premise resonated widely, and the series has been collected into 15 tankōbon volumes as of October 2025.

In late 2024, the series surpassed 100 chapters, a milestone that cemented its staying power on the digital platform. An anime adaptation followed, airing in 2024–2025, with Jōmyaku providing creative input to the production team. Director Hori suggested changes that affected the original work, such as writing the fake Ryoma Sakamoto's name as RYOMA in alphabet letters, showing a collaborative production process. Viz Media began releasing the English-language edition in January 2024, with digital chapters available on the Shonen Jump app and Manga Plus. A character popularity poll in April 2025 celebrated three years of serialization. [edit]

Jōmyaku keeps a low public profile, letting their work speak for itself. Their writing is characterized by a blend of action, romantic comedy, and drama, with protagonists who operate in moral gray areas. Fans of Marriagetoxin appreciate the tight plotting and unexpected twists, as well as the emotional weight drawn from Jōmyaku's own family experiences. On X (formerly Twitter), Jōmyaku engages with fans under the handle @joumyakun, sharing updates and interacting with the community. The fandom participates in events like character popularity polls, such as the one held for the series' third anniversary in April 2025. [edit]

Jōmyaku commands a dedicated readership that spans from Tokyo to New York, yet this audience operates without the feverish rituals of idol fandoms or the chaotic street-closing events seen in pop culture. The fans are defined by their engagement with the text itself, dissecting the moral gray areas of Marriage Toxin and debating the intricate plotting that weaves family drama into high-octane action. They gather on platforms like X under the handle @joumyakun, where the author shares updates, but there is no formal name for this collective, no specific hashtag campaigns, and no organized fan projects documented in the public record. This lack of a branded identity reflects the quiet intensity of manga consumption; the connection is forged through the pages rather than live performances or viral moments.

While the series has achieved massive commercial success, culminating in an anime adaptation announced in late 2025 and a second season confirmed for 2027, Jōmyaku remains a figure whose fame is measured in chapters read and volumes sold rather than global celebrity metrics. iFANN data indicates that as of August 2026, the system has not yet collected sufficient global fame signals to assign a ranking position for this creator. Consequently, Jōmyaku does not currently hold a placement on the iFANN Global Fame Index, nor is there a recorded rank within any specific genre category. The absence of a numerical standing simply reflects the current stage of data collection for niche creators who have not yet crossed the threshold into the broad, real-time celebrity surveillance required for inclusion.[edit]

Jōmyaku frequently weaves personal history into their narrative fabric, once using their favorite idol as the direct visual reference for the character Mei Kinosaki. A subtle but widely discussed detail involves boba milk tea, where the pearls represent lead pellets from the assassin's weaponry; the author insisted on this visual metaphor during early script meetings to ground the violence in something mundane. The partnership between Jōmyaku and illustrator Mizuki Yoda is legendary for its lack of friction, with Yoda enhancing the chaotic energy of the scripts without ever questioning the unhinged plot points. Career highlights include the 2021 release of the one-shot Hyper Hard Special Mission and the April 2022 debut of Marriage Toxin on Shōnen Jump+. The series achieved a major industry milestone in late 2025 when an anime adaptation was announced, followed by confirmation of a second season scheduled for 2027. Production details and cast reveals shared in December 2025 solidified the transition from page to screen. Fans often retell the story of how the boba tea concept originated, noting the author's insistence on the visual metaphor. Another recurring topic in community discussions is the seamless artistic partnership, with fans praising how Yoda's art amplifies the chaotic energy of Jōmyaku's scripts without altering the core intent.[edit]

Jōmyaku is the eldest son in their family. Their father was a government employee who passed away, after which Jōmyaku was told they would take over the household. Their grandmother was a strong, boss-like figure who influenced the family dynamic and, by Jōmyaku's own account, contributed to the story of Marriagetoxin. No other family details are publicly known. [edit]

Jōmyaku's primary creative collaborator is Mizuki Yoda, the illustrator of Marriagetoxin. Their partnership is notably friction-free, with Yoda amplifying Jōmyaku's ideas through artwork. Director Hori, who helmed the anime adaptation, worked closely with Jōmyaku on creative decisions. Voice actor Shion Wakayama voiced Hikaru Gero in the anime. [edit]

There is no publicly documented dating history, relationships, marriages, or romantic partners for Jōmyaku. The creator maintains a highly private personal life, with no information about romantic relationships appearing in any verified interviews, social media posts, or journalistic profiles. As of 2026, their relationship status is not publicly disclosed. [edit]

No credible net worth estimate is publicly available for Jōmyaku. As a manga writer early in their career with a single ongoing serialization, their income is derived from manga royalties from 15 tankōbon volumes, digital distribution on Shōnen Jump+ and Manga Plus, compensation from the anime adaptation, and potential merchandising licensing. Without disclosed figures, any estimate would be speculative. [edit]