The calculated distance (air line) between Ureshinomachi-shimojuku and Hiroshima is approximately 166 miles respectively 268 kilometers.
By car or train, the actual journey to Hiroshima is certainly longer, as only the direct route (as the crow flies) between Ureshinomachi-shimojuku and Hiroshima has been calculated here.
Air line (approximately)
268 kilometers
144 nautical miles