Baki Gaiden: Retsu Kaioh Gets Anime Adaptation From TMS Entertainment

Baki Gaiden: Retsu Kaiō wa Isekai Tensei Shitemo Ikkō ni Kamawan (バキ外伝 烈海王は異世界転生しても一向にかまわんッッ) is officially getting an anime adaptation. The project was announced on August 31, 2026 alongside its first teaser.

TMS Entertainment will handle animation production, maintaining the studio's connection to Baki, Hanma Baki and Baki-Dou. A premiere date, distribution platform and most of the spin-off's staff and cast have yet to be detailed.

> Light spoiler notice: this article discusses Retsu Kaioh's fate following his battle with Miyamoto Musashi in Baki-Dou, which serves as the starting point for the spin-off.

Quick Summary

• Title: Baki Gaiden: Retsu Kaiō wa Isekai Tensei Shitemo Ikkō ni Kamawan
• Japanese title: バキ外伝 烈海王は異世界転生しても一向にかまわんッッ
• English title used in the teaser: BAKI GAIDEN: KAIOH RETSU Doesn't Mind Getting Isekai'd
• Franchise: Baki
• Source format: spin-off manga
• Adaptation: anime
• Announcement date: August 31, 2026
• Announcement material: anime adaptation teaser
• Status: anime adaptation officially announced
• Animation production: TMS Entertainment
• Studio connection: TMS also produced Baki, Hanma Baki and Baki-Dou
• Original concept: Keisuke Itagaki
• Story: Sai Ihara
• Manga: Eiji Murai
• Publisher: Akita Shoten
• Magazine: Monthly Shonen Champion
• Serialization: ongoing since 2020
• Protagonist: Retsu Kaioh
• Story position: spin-off following Retsu's battle with Miyamoto Musashi
• Premise: Retsu awakens in another world
• Retsu's objective: prove the strength of Chinese martial arts in his new world
• World elements: swords, magic, powerful fighters and otherworldly creatures
• Core focus: martial arts combat mixed with isekai fantasy
• Manga milestone: more than 2 million cumulative copies
• Milestone scope: print and digital editions combined
• Milestone period: August 2026
• Volumes available before Volume 17: 16
• Next volume: Volume 17
• Volume 17 release date: September 8, 2026
• Volume 17 price: ¥880 including tax
• Volume 17 length: 176 pages
• Volume 17 ISBN: 978-4-253-01952-1
• Label: Shonen Champion Comics / Monthly Shonen Champion
• Volume 17 arc: opening of the Makai Shito-hen
• Anime premiere date: unannounced
• Distribution / streaming platform: unannounced
• TV network: unannounced
• Director: unannounced
• Series composition / screenplay: unannounced
• Character design: unannounced
• Music: unannounced
• Spin-off anime cast: unannounced
• Episode count: unannounced
• Theme songs: unannounced

Anime Adaptation Teaser

Retsu Continues His Fight in Another World

The spin-off begins from one of the biggest turning points in Retsu Kaioh's journey. Following his battle with Miyamoto Musashi, the Chinese martial arts master eventually awakens fully restored in an entirely different world.

Retsu does not abandon the fighting philosophy that shaped him. Instead, his new goal is to demonstrate that Chinese martial arts can stand against forms of power that would normally never exist within the conventional world of Baki.

Swords, Magic and Fantasy Creatures Become New Opponents

The biggest change comes from the battlefield itself. The physical duels that define Baki remain central, but they are now placed within an isekai setting.

Retsu can face weapons, magic, otherworldly fighters and enormous creatures, allowing his martial arts to be tested well beyond ordinary human combat.

TMS Entertainment Remains With the Baki Franchise

The first major production detail confirmed for the anime is TMS Entertainment as the animation studio.

TMS previously worked on Baki, Hanma Baki and Baki-Dou, keeping the spin-off within the same broader anime production line. Its involvement, however, does not automatically confirm the return of every previous staff or cast member.

Manga Surpasses 2 Million Copies

The manga from Keisuke Itagaki, Sai Ihara and Eiji Murai began serialization in Monthly Shonen Champion in 2020.

As of August 2026, cumulative print and digital circulation has surpassed 2 million copies. This figure represents the combined circulation announced for the manga rather than a publicly displayed platform sales total.

Volume 17 Opens the Makai Shito-hen

The manga remains ongoing. Volume 17 is scheduled for September 8, 2026 from Akita Shoten, priced at ¥880 including tax, with ISBN 978-4-253-01952-1 and a length of 176 pages.

Its official synopsis has Retsu heading toward a portal to the demon realm after his battle against an alchemically created human. The volume marks the opening of the Makai Shito-hen, expanding his battlefield even further.

Why This Matters

1) Retsu Kaioh gets an anime built around him

One of Baki's major fighters now takes the lead in a story centered entirely on his own journey.

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2) Baki's formula meets isekai fantasy

Martial arts and physical strength remain essential, but the opponents and rules of the world are no longer limited by the main series' setting.

3) TMS Entertainment provides production continuity

The studio behind multiple previous Baki anime adaptations is returning for the spin-off.

4) The manga is still active as the anime begins

The adaptation arrives while the manga has passed 2 million cumulative copies and Volume 17 is preparing to continue the story in September 2026.

Anime and Manga Information

Additional confirmed information currently includes:

• The anime adaptation was announced on August 31, 2026.
• TMS Entertainment is handling animation production.
• No premiere date has been announced.
• No streaming or digital distribution platform has been announced.
• TV network details remain unannounced.
• The director and principal staff beyond the studio have not been detailed.
• The spin-off adaptation's cast remains unannounced.
• The episode count remains unannounced.
• Opening and ending themes remain unannounced.
• Music details remain unannounced.
• The manga has been serialized in Monthly Shonen Champion since 2020.
• Keisuke Itagaki is credited with the original concept.
• Sai Ihara handles the story.
• Eiji Murai handles the manga.
• The manga has surpassed 2 million cumulative print and digital copies as of August 2026.
• Sixteen volumes are available ahead of Volume 17.
• Volume 17 releases on September 8, 2026.
• Volume 17 is priced at ¥880 including tax.
• Volume 17 contains 176 pages.
• Its ISBN is 978-4-253-01952-1.
• Volume 17 opens the Makai Shito-hen.
• International anime distribution details remain unannounced.
• Baki Anime Official Website: Baki Anime Series
• Baki Anime Official X: @baki_anime
• Official Anime Teaser: YouTube
• Manga Official Series Page: Akita Shoten
• Volume 17: Akita Shoten

Closing

The anime adaptation of Baki Gaiden: Retsu Kaiō wa Isekai Tensei Shitemo Ikkō ni Kamawan moves Retsu's Chinese martial arts into a radically different arena, where swords, magic and otherworldly creatures become part of his next challenge. TMS Entertainment's return also maintains a production connection with the previous Baki anime lineup.

The August 31 reveal is still only the beginning of the project. Its premiere date, distribution format, streaming platform, main staff, cast, episode count and theme songs all remain to be announced.