Hidden Hamlet refers to a secluded settlement or boundary realm concealed in mountain valleys, scarcely visible to ordinary eyes, and treated as a yokai-like presence in art. In Toriyama Sekien’s Konjaku Hyakki Shūi, a shop-curtain reading “Hidden Village” hangs, with lucky mice and koban coins arranged around it. When a person’s ties to the human world thin, this place appears without warning—sometimes bestowing wealth or food, sometimes vanishing without a trace—embodying the idea of a liminal, protective barrier.