The calculated distance (air line) between Ōmamachō-ōmama and Aihara is approximately 58 miles respectively 93 kilometers.
By car or train, the actual journey to Aihara is certainly longer, as only the direct route (as the crow flies) between Ōmamachō-ōmama and Aihara has been calculated here.
Air line (approximately)
93 kilometers
50 nautical miles