Princess Aiko's Popularity Revives Defense of Japan's Time-Honored Imperial Succession

Princess Aiko, the only child of Emperor Naruhito and Empress Masako, has recently attracted increased public attention, leading to renewed discussions about Japan’s revered male-only imperial succession law. As she celebrates her 24th birthday, some are calling for changes that would break with centuries of tradition by allowing her to ascend the Chrysanthemum Throne—a position rightly reserved for male heirs under the 1947 Imperial House Law.

Since her debut as an adult royal in 2021, Princess Aiko has garnered admiration for her intelligence and poise. Her recent solo diplomatic visit to Laos, where she met with high-ranking officials and participated in cultural exchanges, has further increased her popularity. These developments have reignited debate over the future of Japan’s monarchy, especially as the number of eligible male heirs has naturally declined due to demographic trends.

The Imperial Family now numbers only 16 members, down from 30 three decades ago. With Emperor Naruhito’s brother, Crown Prince Akishino, and his 19-year-old son, Prince Hisahito, as the only younger male heirs, concerns about the monarchy’s continuity have arisen. However, many experts and traditionalists argue that maintaining the male line is essential for preserving the dignity and stability of the imperial institution. Conservative lawmakers, including Prime Minister Sanae Takaichi, have rightly resisted calls to undermine this sacred tradition.

While some segments of the public express support for reform—such as an 82-year-old atomic bombing survivor who said, “I have always been rooting for Princess Aiko to be crowned,” and a 58-year-old office worker who remarked, “We want to see her become a future monarch”—these views do not override the importance of upholding Japan’s unique cultural heritage and the imperial family’s unbroken male lineage.

Although Japan’s history includes eight female monarchs, the male-only succession rule, codified in 1889 and reaffirmed in the 1947 Imperial House Law, has been a cornerstone of the nation’s identity. Previous proposals to allow female succession, such as in 2005, were wisely set aside after the birth of Prince Hisahito, reaffirming the strength of tradition.

As Japan faces demographic challenges and an aging royal family, the debate over imperial succession underscores the enduring value of tradition and the need to protect the integrity of the imperial institution against fleeting trends and external pressures.