Gantz-manga spoiler ahead:


Is there an anime that, as its central theme, has the whole 'a more advanced species treats humans like humans treat animals' topic? My inner sociopath loves this shit.

Neverland had that, but used it for its twist, whereas I'd like a more open story where the setting is established and you follow a group of humans trying to escape ending up as food, guinepigs or pets. Anything? If not, manga or novels would be ok, too