The calculated distance (air line) between Ōtsuki and Higashimurayama is approximately 29 miles respectively 47 kilometers.
By car or train, the actual journey to Higashimurayama is certainly longer, as only the direct route (as the crow flies) between Ōtsuki and Higashimurayama has been calculated here.
Air line (approximately)
47 kilometers
25 nautical miles