Gamera Rebirth

 ( 2023 Anime Onas ) 

In February 2023, Kadokawa revealed the cast and staff. The series would be animated by ENGI, with Hiroyuki Seshita directing, who co-directed Polygon Pictures' Godzilla anime trilogy, Tetsu Iijima producing, Atsushi Tamura designing the characters, and Kan Takahama designing the monsters. A teaser released in January debuted footage, albeit briefly, from the series and revealed that it would consist of six episodes and feature five additional enemy monsters. In March, Kadokawa released a new key visual poster, a synopsis, and a full trailer. As ENGI being a relatively a new company, production of Gamera Rebirth and building ENGI's CGI department were simultaneously progressed, increasing their workloads.

A number of references to previous films and scrapped projects and unused ideas were made, and the time setting of the series (1989) is to represent both eras of Showa and Heisei.Kadokawa Anime, October 12, 2023, GAMERA -Rebirth- | Special Interview Part 4, at 01:37 and 06:15, Youtube Designs of Gamera and Gyaos, and the first scene of Gamera to fight against a flock of small Gyaos in the first episode were reused from the 2015 short film, and Katsuhito Ishii, the director of the 2015 short film was credited as the designer of Gamera. The titles of each episodes are references to classic films and other productions; Kanał, Run Silent, Run Deep, Daiei Film's Destiny's Son in which Masaichi Nagata and others such as Ichikawa Raizō VIII (the spouse of Masaichi's adopted daughter Masako Ōta) had participated in, The Moon Is a Harsh Mistress, Childhood's End, and Aura Battler Dunbine. Aura Battler Dunbine was directly mentioned and an actual publication of Dunbine was briefly depicted within the first episode; its episode title and the location (Nishi-Shinjuku) were tributes to Yoshiyuki Tomino by Shinichiro Inoue (jp) as Inoue was once a editor in charge of Tomino including the Dunbine publication, and Inoue specially gained a permission to use the book from Arata Sasaki (jp) for the reference.

Seshita approved the offer for the Netflix series partially because Kadokawa approved his request to focus on kaiju battles which he couldn't achieve in the Godzilla anime trilogy. He originally prepared fighting scenes twice or five times more than actual ones, including more diverse abilities and characteristics of kaiju, however he had to cut them due to budget and schedule, and noted the difficulty to insert kaiju battles in every episode due to budgetary constraints. One of policies for battle scenes was not to depict human casualties by Gamera, therefore such depictions were avoided during Gamera's appearances in early episodes in Tokyo; Gamera arrived at Tokyo after most evacuations were completed, and he threw Gyaos and Jiger at open areas without people (Showa Memorial Park in the first episode, and a riverbed of Tama River in the second episode). This direction was also effective to reduce production costs. Seshita also highlighted the concept of "children, who have been protected by Gamera, in return protect Gamera".

Japanese punk rock band Wanima provided both opening and ending songs, Natsuake and FLY&DIVE (jp).Wanima official website, July 24, 2023, 「GAMERA -Rebirth-」9月7日よりNetflixにて世界配信決定!!主題歌は、WANIMA「夏暁」に決定!! An acoustic version of Gamera March (ja), the iconic song used in Showa films and other medias, was also inserted.Shazam, Gamera March -Rebirth- Edition

Joshua Kristian McCoy from GameRant did not consider Gamera Rebirth to be an "ideal" introduction for newcomers. McCoy also criticized the animation for being "jittery" and compared it to the animation from Robot Chicken, and found the concept to be flawed; he specifically targeted the series' tone and its depressing climax, calling them improper for a Gamera story. He concluded by ridiculing the creators for taking inspiration from Godzilla Singular Point instead of Shin Godzilla, stating that the series starts "rough, gets weird, and ends almost impressively poorly." James Beckett from Anime News Network scored the series a C+, commenting that "it's a shame that the ugliness of visuals will likely turn away a good many potential fans because underneath all of that jank is a solid kaiju adventure". Masaki Tsuji positively reviewed the series for its variety of fighting sequences and uniqueness of human characters.

Insufficiency of budget and schedule has also been pointed out;Sam Pearce, September 12, 2023, Review: Netflix's 'Gamera: Rebirth', The Cosmic Circus 3D models of humans are poor and do not fit in with 2D backgrounds.Sean Barry, 2023, Anime Review: Gamera Rebirth (2023) by Hiroyuki Seshita, Asian Movie Pulse It also lacks an opening animation which is a common feature of Japanese anime.KADOKAWA Anime, September 9, 2023, 『GAMERA -Rebirth-（ガメラリバース）』オープニング映像｜WANIMA「夏暁」, Youtube Additionally, as aforementioned, fighting scenes were declined to the half or even less (20%) of what Seshita originally intended where it was very difficult to add kaiju battles in every episode due to budgetary problem. A number of abilities and characteristics of kaiju were also eventually not used.

Fussa City and Tsushima Island were elected for one of Anime Pilgrimage Sites of 2024 by the Anime Tourism Association as Gamera battled Gyaos and Jiger in the former, and fought against Zigra at the Omega Station.Dengeki Online, February 12, 2024, “訪れてみたい日本のアニメ聖地88”2024年版が発表。『ぼっち・ざ・ろっく! 』『その着せ替え人形は恋をする』『GAMERA -Rebirth-』などが新たに選出 , KADOKAWA Game Linkage

Ryan Bartley, who voiced Boco in the English edition was nominated for the 2023 Voice Arts Awards.Ryan Bartley, December 11, 2023, Super honored to be nominated for TWO SovasVoice Voice Arts Awards in the categories of Outstanding Anime Character for Netflix’s Gamera Rebirth AND Outstanding Video Game Ensemble for Sonic Frontiers!!!!, Twitter (X)