Hosoya competed at the first Olympic triathlon at the 2000 Summer Olympics. She did not finish the competition.
Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill; et al. "Haruna Hosoya". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 17 April 2020. Retrieved 22 May 2010.