Supplied photo shows Prince Hisahito at the National Agriculture and Food Research Organization in Tsukuba, Ibaraki Prefecture, on Aug. 2, 2023. (Photo courtesy of the Imperial Household Agency) (Kyodo)

TOKYO - Prince Hisahito, the nephew of Emperor Naruhito and second in line to the Japanese imperial throne, turned 17 on Wednesday as he continues to thrive in his second year of senior high school.