Japan's legislature is working on legislation that would allow the imperial family to adopt distant male relatives to address a growing succession crisis, as the world's oldest continuous monarchy faces a shortage of potential heirs.

The proposed plan would enable the imperial family to bring in male descendants from former noble families to ensure the line of succession continues. Under Japan's current laws, only males can ascend to the throne, and the imperial family has been shrinking in recent decades.

The succession issue has become increasingly urgent as Emperor Naruhito has only one child, Princess Aiko, who cannot inherit the throne under current law. His younger brother, Crown Prince Akishino, has one son, Prince Hisahito, who is currently the only male heir of his generation.

The adoption proposal represents one potential solution to the crisis, though it has generated debate within Japan. Some citizens and experts have advocated for allowing female succession instead, which would enable Princess Aiko to potentially become empress.

The imperial succession question reflects broader discussions about tradition and modernization in Japanese society. While the proposed adoption plan would maintain the male-only succession system, it would mark a significant change in how the imperial family operates and expands its membership.

Japanese officials have not announced a timeline for when the legislation might be finalized or implemented.