The calculated distance (air line) between Setakamachi-takayanagi and Hiroshima is approximately 143 miles respectively 230 kilometers.
By car or train, the actual journey to Hiroshima is certainly longer, as only the direct route (as the crow flies) between Setakamachi-takayanagi and Hiroshima has been calculated here.
Air line (approximately)
230 kilometers
124 nautical miles