The calculated distance (air line) between Kamojimachō-jōgejima and Osaka is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Osaka is certainly longer, as only the direct route (as the crow flies) between Kamojimachō-jōgejima and Osaka has been calculated here.
Air line (approximately)
127 kilometers
68 nautical miles