The core plot follows her integration with human characters Kouta and Yuka while pursued by scientists and assassins like Bando and Kurama, with flashbacks revealing childhood bullying that fuels her rampages. The central discrimination theme against the fictional Diclonius species drives trauma and violence yet stays a sci-fi horror allegory without modern identity politics framing, focusing instead on human cruelty, revenge, and existential alienation in a mutant-versus-human conflict. Director Mamoru Kanbe explicitly aimed to explore how humans divide by difference and how mistreatment breeds atrocities, framing Diclonius persecution as a cycle of alienation rather than any activist manifesto.

There are no race, gender, or sexuality changes to established characters, no LGBTQ+ elements, and no DEI casting, with the all-Japanese voice cast remaining standard for 2004 anime. This keeps the emphasis on universal themes of alienation and retaliation without injecting contemporary critiques of patriarchy, systemic oppression, or traditional norms.