Crayon Shin-chan: Roar! Kasukabe Animal Kingdom

Mamoru Shizime, the newly elected mayor, created the Human Animalization Plan as a radical solution to prevent environmental destruction. Driven to despair over humanity's neglect of nature, he believed that transforming humans into animals would eliminate ecological harm. The plan involved distributing a special potion that turned people into animals while erasing all memories of their human lives, effectively replacing humanity with animals that would live harmoniously with nature.

The movie hints at Mamoru's extreme environmental motivations early in the timeline when he launches aggressive ecology initiatives as mayor.

After accidentally drinking the light green liquid that Shinnosuke found, Hiroshi transformed into a rooster and Misae transformed into a leopardess. The most devastating consequence was that once transformed, they lost all memories of their human lives forever. This memory erasure was a central tragedy of the potion and a key conflict Shin-chan had to confront.

The mysterious bottle discovered at the riverbank was clearly significant, as Shin-chan brought it home without knowing its true nature.

Victoria is revealed to be Yoshiko Shizime, the wife of Mamoru Shizime. She initially appears as a mysterious ally helping Shin-chan and his family escape, but her true identity is uncovered during the final battle. Yoshiko explains that she didn't care much for nature herself, which makes Mamoru's extreme plan even more poignant, it was motivated by both environmental despair and his love for her.

Victoria's sudden appearance to help the family seems oddly convenient given the danger level, hinting at a deeper connection.

During the climax at the underground base, Misae (now fully transformed into a leopardess) unexpectedly regained her human memories. This emotional moment allowed her to break free from the control of Mamoru's forces and help rescue the Kasukabe Defense Force. The restoration of her memories was crucial to turning the tide against the villains and provided the emotional core of the final confrontation.

The bond between Misae and her family remains strong throughout, suggesting her memories weren't completely erased.

The DX potion was a special variant of the Human Animalization drink that Mamoru consumed during the final confrontation. Unlike the regular potion, DX transformed him into a Chimera, a hybrid creature combining multiple animal features. This powered-up form made him a formidable opponent in the final battle against Shin-chan and his friends.

Mamoru's extreme commitment to his plan suggests he would be willing to transform himself if necessary.

Hiroshi, now transformed into a rooster and having lost his human memories, inadvertently led the group down the wrong path due to his animal instincts. His rooster nature caused him to follow paths that seemed natural to a rooster but were actually a trap set by Bunbetsu. This tragic moment shows how the transformation not only changed their bodies but also their behavior and instincts.

The story establishes early on that transformed individuals lose their human consciousness and act according to their animal nature.

The city began transforming because Mamoru was actively executing his Human Animalization Plan on a city-wide scale. With the underground base operational, the potion was being distributed throughout Kasukabe, causing random citizens to transform into animals. This escalation turned the situation from a personal family crisis into a city-wide catastrophe that Shin-chan had to stop.

Mamoru's speech about eradicating ecological harm through his plan indicated he intended to affect everyone, not just specific targets.

The humans were reverted after Mamoru Shizime smashed the main animalization potion in an act of love and reconciliation. With the central source of the transformation destroyed, the effects were reversed across the city. Hiroshi and Misae returned to human form, and all other affected citizens recovered their original bodies, restoring Kasukabe to normal.

The battle takes place around the main potion reservoir, making its destruction the logical solution.

Himawari, Shin-chan's younger sister, also consumed some of the animalization potion and transformed into a polar bear during the final battle. Her powerful polar bear form proved crucial in the confrontation, as she was able to assist the undersized elephant-form Shin-chan and help turn the tide against Mamoru's forces. Her intervention demonstrated the family's united effort to save their parents.

Earlier in the story, several members of the group consumed the potion and gained animal abilities, including Himawari.

Mamoru smashed the potion after learning the truth about his wife Yoshiko's identity and hearing her explain that she never cared about nature. Realizing his extreme plan was based on a misunderstanding, that she shared his passion for environmentalism, he was overwhelmed with love and chose reconciliation over his ideological mission. This emotional realization caused him to sacrifice his own plan to save their relationship.

Yoshiko's reveal as Victoria and her earlier assistance to Shin-chan hints at her true feelings about the plan.

SKBE is the secret organization led by Mamoru Shizime that executes the Human Animalization Plan. The group operates from an underground base hidden beneath Kasukabe and employs henchmen, including Bunbetsu, to capture anyone who has drunk the potion and may expose the plan. SKBE represents the antagonistic force that Shin-chan and his friends must confront throughout the movie.

The mysterious group led by Bunbetsu that attempts to capture Shin-chan's family operates under someone's command.