Prince Hisahito turns 20 as Japan enforces male-only succession rules

On September 6, 2026, Japan's Prince Hisahito turned 20, drawing attention as a future monarch. He is the nephew of Emperor Naruhito and is currently studying biology at the University of Tsukuba. His birthday coincides with the government's controversial revision of the Imperial House Law, which reinforces male-only succession rules, leading to public protests and criticism.