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The settlement of Hokkaido was during the Meiji period (1868-1912) which is when the Hisui games take place.
Haussmann's renovation of Paris happened between 1853 and 1870. Assuming this is the time period PLZA happens, it will actually be a prequel and Volo will be a child.
But even if it's more modern, say 1970, it's fully in the realm of possibility it'll be the same character, just older.
