Baki’s Retsu Kaioh Isekai Spinoff Set for TV Anime

TMS Anime announced on Monday that a spinoff of Keisuke Itagaki’s Baki manga will receive a TV anime adaptation.

The manga is Baki Side Story - Kaioh Retsu Doesn't Mind At All If He Gets Reincarnated in Another World (Baki Gaiden: Retsu Kaioh wa Isekai Tensei Shitemo Ikkō ni Kamawan).

The story follows Kenpo-style master Retsu Kaioh, who reincarnates in another world after dying in a fight against swordsman Musashi Miyamoto.

The manga began in Akita Shoten’s Monthly Shōnen Champion in 2020. Its credited creators are:

• Eiji Mutsui: art
• Keisuke Itagaki: original concept
• Sai Ihara (Daisuke Ihara): story

Akita Shoten released the first collected volume in May 2021 and volume 16 on March 6. Volume 17 ships September 8. The series has more than 2 million copies in circulation across print and digital editions.

In July, the Baki The Grappler STAGE staff also announced a stage adaptation, Baki The Grappler STAGE Gaiden -Retsu Kaioh wa Isekai Tensei Shitemo Ikkō ni Kamawan.

The play will run March 19–22, 2027, at Tokyo’s Owl Spot (Toshima Ward Performing Arts Exchange Center).

The franchise’s manga history includes:

• Baki The Grappler: Itagaki’s original martial arts manga ran in Akita Shoten’s Weekly Shōnen Champion from 1991 to 1999, totaling 42 volumes. Kodama Tales began its worldwide English publication in October 2025.
• Baki: The sequel ran from 1999 to 2005 across 31 volumes. Media Do publishes it in English.
• Hanma Baki: Itagaki followed Baki with this 37-volume series, serialized in Weekly Shōnen Champion from 2005 to 2012.
• Baki-Dou: The franchise’s fourth manga began in Weekly Shōnen Champion in March 2014 and concluded in April 2018 with 22 volumes.
• The second Baki-Dou: This series ran in Weekly Shōnen Champion from October 2018 to June 2023. It kept the Baki-Dou name but used different characters for “Baki” in its title.
• Baki Rahen: The franchise’s latest manga began in Weekly Shōnen Champion in August 2023.

The franchise’s Netflix anime releases include:

• Baki: The new adaptation of Itagaki’s Baki (New Grappler Baki: In Search of Our Strongest Hero) debuted in Japan in June 2018. Its first season ran for 26 episodes through December 2018.
• Baki’s international rollout: Netflix released the first 13 episodes outside Japan in December 2018, then added the season’s second half in March 2019.
• Baki: Dai Raitaisai-hen: All episodes arrived together worldwide on Netflix in June 2020.
• Baki Hanma: Netflix’s third Baki series continued Baki: Dai Raitaisai-hen. All 12 episodes debuted worldwide in September 2021.
• Baki Hanma season two: The “Tale of Pickle & The Pickle War Saga” debuted worldwide on Netflix in July 2023. “The Father VS Son Saga” followed in August 2023.
• BAKI-DOU: The Invincible Samurai: The adaptation of Itagaki’s first Baki-Dou manga premiered worldwide on Netflix on February 26, releasing its first 13 episodes together.
• BAKI-DOU’s second part: The second cours, a quarter-year programming block, premiered exclusively on Netflix worldwide on June 18. All 12 episodes became available together.