Yes, the Japan Rail (JR) Pass is valid on local JR-branded bus lines, but it does not cover the vast majority of private or municipal bus systems in Japan. Specifically, you can use your pass on local buses operated by JR Hokkaido, JR Bus Tohoku, JR Bus Kanto, JR Tokai Bus, West Japan JR Bus, Chugoku JR Bus, and JR Kyushu Bus. This is particularly useful for reaching certain tourist spots like the Lake Towada area or parts of Kyoto that are better served by the JR bus network. However, it is a critical peer-to-peer essential to know that the JR Pass does not cover "Highway Buses" (long-distance express buses between cities), even if they are operated by JR companies. To use the local JR bus, you simply show your physical or digital pass to the driver when exiting. While the pass is primarily designed for the Shinkansen and regional trains, these "included" bus routes provide high-value "last-mile" connectivity in rural areas where the rail network might be limited, ensuring you can reach your final destination without needing extra cash for local fares.