Eureka Seven Hi-Evolution is a trilogy of anime films that takes place before and during the events of the original Eureka Seven series, as well as having an original story. Studio BONES and the most of the show's original staff (including director Tomoki Kyoda, writer Dai Sato and composer Naoki Sato) return, with CGI sequences in the second film provided by Graphinica.
The trilogy is comprised of:
- Eureka Seven Hi-Evolution 1Japanese title (2017)
- Anemone: Eureka Seven Hi-EvolutionJapanese title (2018)
- Eureka: Eureka Seven Hi-Evolution.Japanese title (2021)
The first film is presented as a partial prequel to the series, showing the previously unseen events of The Summer of Love incident before becoming a compilation of of the show's middle arc of Renton's time with Charles and Ray, though with some differences. The second film takes a turn into an Alternate Universe in which Anemone must face against the mysterious world-ending threat known as "Eureka Seven" whilst hoping to avenge her father's death.
The Eureka Seven Hi-Evolution films contain Hi-Evolution-exclusive examples of:
- 2D Visuals, 3D Effects: Some of the vehicle animation is rendered in 3D in both movies during the new footage while the mecha remain 2D.
- Anime Theme Song:
- Hi-Evolution 1's ending theme is Glory Days by Hiroya Ozaki.
- Anemone's ending theme is There's No Ending by Ruann.
- Aspect Ratio Switch: Any clips taken from the series are presented in the original full screen aspect ratio, while all the new footage is in widescreen.
- Idiosyncratic Episode Naming: The second and third films go with naming them after a central character but the first film is an Odd Name Out by being without a subtitle.
- Action Prologue: The entire Summer of Love sequence.
- Alternate Continuity: Is one to the original show with the general story being the same but with some big differences in Renton's relationship and backstory with Charles and Ray.
- Anachronic Order: Presented as such through Renton's stream of consciousness perspective so events from days or hours before/ahead constantly play based on what he's focused on. Though the perspective of time is played to present day, in this case Renton on his way to reunite with Eureka, as the film ends by noting he'll meet Eureka again in 18 hours and 24 minutes.
- Compilation Movie: Essentially one of the Charles and Ray arc of the original show.
- Early-Bird Cameo: Posters of Anemone as an idol can be seen in the background at certain points.
- Fun with Subtitles: Taken to an extreme. Multiple characters, locations and objects all receive subtitles lining out their names, occupations, history etc over the course of the film.
- Mind Rape: Seemingly what happens to Dewey when he comes face to face with the Silver Box Base Component which overwhelms him and his LFO but ultimately leaves him alive following Adroc's sacrifice, unscathed but clearly shaken.
- Related in the Adaptation: Charles and Ray adopted Renton in this universe following Adroc's death rather than him being in the care of Axel Thurston like in the original.
- The Stinger: Has one acting a preview for the next film, styled like that of the show's after credits previews. Though none of the footage shown actually happens in the next film.
- Aborted Arc: None of the scenes shown in the first film's after credits preview occur in this story. The only hold overs being Anemone in her military themed idol outfit which she wears for different reasons and the four girls performing alongside her appearing but in a different capacity.
- An Arm and a Leg: Dewey's legs are fading away, seemingly representative of the fact he comes from another universe (likely to be that of Hi-Evolution 1). He regains them when he escapes the facility, now having mysterious power of his own.
- Apocalypse Maiden: Eureka has essentially become one herself. Empowered by the Silver Box, the new (and ultimately failed) worlds she creates to bring Renton back are bringing the actual world to destruction & caused billions of deaths.
- Art Shift: The sequences/flashbacks involving young Anemone and Eureka are presented in CGI but the rest of the film is traditionally animated.
- Aspect Ratio Switch: Done whenever Anemone is diving into the "Eureka Seven" world, where she inhabits scenes from the original series as her series counterpart fighting Eureka and the Nirvash as presented in their original 4:3 ratio.
- Cliffhanger: An alive Renton is out there (on another planet as it appears) swearing he'll come back to Eureka as she, Anemone & Dominic see his message calling for her on the Nirvash while an escaped Dewey watches on.
- Cosmic Retcon: Through the power of the Silver Box, Eureka has created multiple realities in search of one where she and (the currently dead in the main world) Renton can live happily. All these realities are the previous series, films, games and manga. Though it is brought into question that the power of the Silver Box simply granted her the ability to see those other universes for her to copy as Dewey calls those created worlds fake.
- Crucified Hero Shot: Villainous example. Dewey is kept in custody by the military in this pose, he even calls them out on it.
- Disappeared Dad: Anemone's father Ken, who died several years earlier failing to stop "Eureka Seven".
- Red Eyes, Take Warning:
- Eureka's eyes glow red while offering Anemone the chance to live in a world where her dad is alive.
- Dewey's eyes also glow red when he escapes imprisonment.
- Mythology Gag:
- The Insert Song that plays when Anemone and Dominic are fighting "Eureka Seven" so she can dive in one last time is a cover of Ryuichi Sakamoto's Ballet Mecanique by Etsuko Yakushimaru. The song title was used as the name of episode 48 of the original show, the episode in which Anemone switches sides and becomes a couple with Dominic.
- The failed worlds that Eureka tried to create to bring Renton back flash on screen while she's talking about them. Among them are the original series, ''Pocketful of Rainbows'' film, ''AO'', the video games and the manga adaptations.
- Naked on Arrival: The 6 girls who previously tried diving into "Eureka Seven" before Anemone appear as such in the finale after Eureka finally gives up her mission. They're all notably covered up by green slime coming out of a big Nirvash.
- Robot Buddy: The Dominic app that Anemone's father Ken created for her operates as one for her. Though the Dominic that appears whenever she dives is much more than that.
- Uncertain Doom: It's not addressed by the end if Dr. Bear is still alive or not after Dewey escapes imprisonment and shatters the glass window in his direction.