Japan’s Princess Aiko: Why She Can’t Inherit the Throne or Japan’s Princess Aiko & the Debate Over Male-Only Succession

by John Smith - World Editor
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Tokyo – The world’s oldest continuous hereditary monarchy is facing increasing scrutiny as japan’s imperial family navigates a potential succession crisis. Despite strong public affection,Princess Aiko,the only child of Emperor Naruhito and Empress Masako,is barred from inheriting the Chrysanthemum Throne due to Japan’s 1947 Imperial House Law which restricts succession to male heirs. [[1]] The current situation, where 18-year-old prince Hisahito is the sole male heir apparent, is fueling a national debate over the future of the imperial institution and whether longstanding traditions should be reformed. [[3]]

  • Princess Aiko is the only daughter of the Japanese Emperor and Empress.
  • She is ineligible to inherit the throne due to Japan’s male-only succession laws.
  • Her cousin, Hisahito, is currently the sole male heir apparent.
  • Experts are warning that the monarchy could face extinction without reforms.

Japan’s imperial family is facing a potential succession crisis as the future of Princess Aiko, the only child of Emperor Naruhito and Empress Masako, remains uncertain. Despite her popularity with the Japanese public, current laws prevent the 24-year-old princess from ascending the Chrysanthemum Throne. The situation highlights a long-standing debate over the future of the world’s oldest continuous hereditary monarchy.

Princess Aiko has garnered significant public attention in recent years, often celebrated in Japan with a level of enthusiasm typically reserved for pop stars. During a recent visit to Nagasaki, cheers for the princess reportedly overshadowed applause for her parents. She is increasingly viewed as a modern representative of the monarchy, having actively engaged with the public through recent appearances and her academic pursuits, which include studies in Japanese language and literature and English at Eton College. In November, she completed a visit to Laos, marking a significant milestone in her royal duties.

Male-Only Succession Law

Were Princess Aiko born into another royal family, she would likely be in line to become queen. However, Japanese law, established in 1947, stipulates that only males can inherit the throne. The last empress to rule Japan reigned from 1762 to 1771, before the enactment of Article 1 of the Imperial House Law.

Currently, Princess Aiko’s cousin, 18-year-old Prince Hisahito, is next in line for succession. This has raised concerns, as he is currently the only male member of the imperial family who could potentially become emperor. For years, the law has sparked controversy, and with the dwindling number of eligible male heirs, calls for reform are growing louder.

Despite the pressure, the law remains unchanged. Women are excluded from the line of succession, and those who marry outside the imperial family forfeit their royal status, a status they cannot pass on to their children. Experts warn that without reform, the monarchy could eventually disappear. However, conservative politicians, including Prime Minister Sanae Takaichi, continue to resist any changes to the existing rules.

What do you think about the fact that Princess Aiko is excluded from the throne because she is a woman?

Public Support for Aiko

Since her public debut in 2021, Princess Aiko has won over the hearts of many in Japan, being perceived as intelligent, compassionate, and possessing a good sense of humor. Her first solo overseas trip to Laos further boosted her popularity. Visits to Nagasaki and Okinawa have also solidified her image, particularly her efforts to commemorate the victims of World War II. Supporters, like 82-year-old atomic bomb survivor Setsuko Matsuo, hope to see Aiko on the throne one day. Activists are now using various platforms, including comics, YouTube channels, and flyers, to advocate for reform.

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Felipe Cordova (cof), a People desk intern at 20 Minuten since 2025. He covers national and international stars and their stories.

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