A significant revision to Japan’s 1947 Imperial House Law officially took effect this Saturday. The primary objective of the new legislation is to address the dwindling number of imperial family members, a trend that has raised concerns about the long-term viability of the monarchy.

Under the new rules, the imperial family is now permitted to adopt males aged 15 or older from 11 former imperial branch families. To be eligible, these individuals must be descended from past emperors through the male line. Additionally, the law includes provisions that allow female members of the imperial family to retain their status and official duties even after marriage, a change from previous requirements that forced them to leave the family upon wedlock.

While the government framed these changes as a necessary measure to ensure the continuity of the imperial line, the legislation has sparked debate. The revised law explicitly preserves the traditional male-only succession system. This decision persists despite various public opinion polls indicating that a significant portion of the Japanese public supports the idea of allowing female emperors to ascend the throne. Critics of the law argue that the government missed an opportunity to modernize the institution, while proponents maintain that the male-only lineage is essential to the historical identity of the Japanese monarchy.