Princess Aiko of Japan, born 1 December 2001 in Tokyo, is the only child of Emperor Naruhito and Empress Masako — and under current Japanese Imperial Household Law cannot succeed to the throne of her father because she is female. Her position has been at the centre of Japan's most-discussed constitutional question for over two decades.

Her Parents

Father: Emperor Naruhito, born 23 February 1960 — 126th Emperor of Japan since 1 May 2019.

Mother: Empress Masako, born Masako Owada, 9 December 1963 — former Japanese diplomat who married then-Crown Prince Naruhito in 1993 after a six-year courtship.

Her Position in Succession

Under the Imperial Household Law of 1947, only male descendants of the male line may succeed. This means that Aiko, an only child, cannot inherit her father's throne — and the line of succession passes instead to Crown Prince Akishino (her uncle, Naruhito's younger brother) and then to Prince Hisahito (her young cousin).

The question of whether the Imperial Household Law should be amended to allow Aiko to succeed has been a major public-policy debate in Japan for over twenty years.

Her Education and Public Life

Aiko attended Gakushuin Kindergarten through Gakushuin Girls' Senior High School — the traditional school for Imperial Family members. She graduated from Gakushuin University with a degree in Japanese language and literature in March 2024, and now works at the Japanese Red Cross Society in Tokyo.

She speaks Japanese, English, and basic French and Spanish. She is widely seen by Japanese citizens as a popular and grounded member of the Imperial Family.

The Japanese Imperial Family Tree at a Glance

Dynasty: Imperial House of Japan / Yamato (since c. 660 BC, mythologically; continuously documented from 539 AD).

Grandparents (Paternal):

  • Emperor Emeritus Akihito (b. 23 December 1933) — 125th Emperor, 1989–2019
  • Empress Emerita Michiko née Shōda (b. 20 October 1934) — first commoner to marry into the modern Imperial Family

Parents:

  • Emperor Naruhito (b. 23 February 1960)
  • Empress Masako née Owada (b. 9 December 1963) — Harvard, Tokyo University, Oxford; former diplomat

Uncle: Crown Prince Akishino / Prince Fumihito (b. 30 November 1965).

Cousins: Mako Komuro (b. 1991), Princess Kako (b. 1994), Prince Hisahito (b. 2006).

Princess Aiko:

  • Born 1 December 2001, Imperial Household Hospital, Tokyo
  • Title: Princess Aiko, Princess Toshi
  • Gakushuin University (BA Japanese Language and Literature, March 2024)
  • Joined the Japanese Red Cross Society, April 2024
  • Currently excluded from Imperial succession by 1947 Imperial Household Law

What the Imperial Family Story Teaches Us

A father who waited 30 years to become Emperor. A mother who left a Harvard-and-Oxford-and-foreign-ministry diplomatic career for a complicated royal-household life. An only daughter excluded from succession because of her sex. A nationwide debate over whether the rules should change for her.

For every family — large or small, famous or otherwise — the Aiko story carries the same lesson. Family inheritance rules and family love sometimes pull in different directions. The Japanese Imperial Family loves Princess Aiko while the Imperial Household Law excludes her from the line of succession. Write down the rules your own family operates under — and the people those rules touch in surprising ways.

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