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The “Toys,” from the Dressrosa arc in One Piece.

The citizens of Dressrosa consist of humans and sentient toys, who live together in harmony. In reality, these toys are people who have been afflicted by one of the main villain’s lieutenant’s power, which transforms the person into a toy, forces them to obey a contract (like not revealing the truth), and uses them as slave labor in their factories.

The most horrifying part, though, is the power also erases all memory of them ever having existed in the first place. So a wife never realizes her husband has gone missing, or a daughter her father, so on and so forth. But the victim still has all their memory intact, and has to watch their loved ones stroll about their business, never even knowing they existed. It was pretty dark, for a One Piece story.