This index defines one of the primary regional diversity domains of Japanese folklore. It documents yōkai and folkloric beings whose identities are bound to specific local traditions, villages, and geographic areas across Japan.
Many of these entities are unknown outside their places of origin and survive only through fragmentary records, oral tradition, and localized ritual practice. They reflect the diversity, locality, and regional memory that form the cultural foundation of Japanese folklore.
This domain functions as the regional diversity pillar of Japanese folklore, preserving local belief systems and geographic mythologies within the broader folkloric structure.