TOKYO — Supporters of Princess Aiko are renewing calls to revise Japan’s male only succession law as the popular royal marks her 24th birthday, intensifying debate over the future of an imperial family that is rapidly shrinking.
Princess Aiko, the only child of Emperor Naruhito and Empress Masako, has become a crowd favorite in recent years, often drawing louder cheers than her parents during public appearances. Her rising popularity has strengthened public support for a female emperor, a possibility barred under Japan’s current Imperial House Law.
Advocates warn that succession reforms can no longer be delayed. Japan’s monarchy is facing a demographic crisis, with only one eligible heir from the younger generation, 19 year old Prince Hisahito, the nephew of Emperor Naruhito.
Experts argue that lifting the ban on female succession is crucial to preventing the imperial line from dying out. However, conservative lawmakers, including Prime Minister Sanae Takaichi, strongly oppose any change to the male only rule.
Princess Aiko’s public image has grown since she debuted as an adult royal in 2021, praised for her intelligence, warmth and humor. Her first solo overseas trip to Laos last November further boosted her profile, as she represented the emperor in meetings with top officials and engagements with local communities.
Earlier this year, she joined her parents on visits to Nagasaki and Okinawa. Observers note that she has embraced her father’s commitment to preserving the memory of World War II.
Many Japanese have expressed admiration for Aiko’s character and leadership potential. Among them is 82 year old Nagasaki atomic bombing survivor Setsuko Matsuo, who said she has long hoped to see Aiko ascend the throne. Others, like 58 year old office worker Mari Maehira, say they have followed Aiko’s growth for years and now wish to see her become monarch.
A movement pushing for reform has grown. Some supporters distribute comics urging lawmakers to allow Aiko to become emperor, while others run YouTube channels and online campaigns to raise awareness. Advocates like Ikuko Yamazaki say excluding Aiko threatens the monarchy’s survival and reflects outdated views on gender.
Born on December 1, 2001, Aiko grew up in the public eye. Her mother, Empress Masako, suffered a stress related condition after facing pressure to produce a male heir. Aiko was known as a bright child who memorized the names of sumo wrestlers, but she faced bullying in elementary school and health concerns during her teens.
Aiko graduated from Gakushuin University in 2024 and has since taken on official duties while working at the Red Cross Society. She enjoys weekend walks with her parents and recreational sports with palace staff.
Japan’s Imperial Family has dwindled to only 16 adults, down from 30 three decades ago. Under the 1947 Imperial House Law, only males in the paternal line may ascend the throne, and female members lose their royal status upon marrying commoners.
The line of succession is now limited to Crown Prince Akishino, his son Prince Hisahito, and 90 year old Prince Hitachi. Crown Prince Akishino acknowledged the strain on the royal family but said change is impossible under the current system.
The shrinking pool of heirs has alarmed historians, who note that Japan’s monarchy, believed to be 1,500 years old, once included eight reigning empresses. The male only rule was introduced in 1889 and maintained after World War II.
A government proposal in 2005 to allow a female emperor was abandoned after the birth of Prince Hisahito. In 2022, a conservative panel recommended keeping the male line system while allowing female royals to retain their status after marriage. The panel also suggested adopting male heirs from distant branches, a proposal critics say is impractical.
International pressure has mounted. Last year, the United Nations women’s rights committee urged Japan to permit a female emperor, saying the current ban undermines gender equality. Tokyo rejected the call, calling it inappropriate and asserting that imperial succession is tied to national identity.
Scholars say Japan faces a critical choice between preserving tradition and ensuring the survival of its monarchy. As one expert put it, the question is no longer about male versus female succession, but how to save the imperial institution itself.
