Japan's parliament has ended a years-long debate over the future of the Chrysanthemum Throne in a way many did not expect: instead of opening the door to the female line, it entrenched the male, paternal line of succession alone. And it did so despite strong public support for the opposite.

The new law brings two changes. It lets more distant male relatives over the age of 15 return to the imperial family through adoption, provided they are unmarried. And it lets princesses keep their imperial status after they marry a commoner - but their husbands and children remain unrecognised as members of the imperial family. Half-measures, carefully designed to keep the real door locked.

A crisis right at the top

The measure is trying to solve a demographic crisis at the heart of the monarchy: of sixteen adult members of the imperial family, only a fifth are men, and there are no children. Prince Hisahito, 19, the emperor's grandson, is the first male child born into the imperial family in four decades. If he ends up without a son, under the current rules there is no heir - and the imperial line simply ends.

The political irony is hard to miss. It was Japan's first woman prime minister, Sanae Takaichi, who led this reform. Takaichi and the conservative wing of the Liberal Democratic Party argue that the male bloodline is „the sole source of imperial authority and legitimacy". Professor Hideya Kawanishi of Nagoya University judged that the proposal „does not reflect the public will".

Cold air in the royal palaces

Princess Aiko, 24, the only child of the emperor and empress, enjoys huge popularity - but as a woman she cannot inherit the throne. Ahead of her in line stand her uncle Akishino (60) and his son Hisahito, and third is 90-year-old Prince Hitachi. Empress Masako, a Harvard-educated diplomat, developed depression and anxiety after Aiko's birth, over criticism that she had not produced a boy. Feminist theorist Chizuko Ueno says the system treats male members as studs and demands that women function as machines for producing male heirs.

Sweden, the Netherlands, Norway, Belgium, Denmark and Luxembourg introduced full succession regardless of sex long ago. Japan remains among the few constitutional monarchies that exclude women entirely - stricter even than Monaco. The institution has existed for around 1,500 years historically, or 2,600 by the traditional count. Historically, concubines bore roughly half of Japan's emperors, until that practice ended. Without that mechanism, and with an ageing, shrinking birth rate, historians warn the male line cannot survive in the long run - many of the possible adoptees are as far as 36 generations removed from the current emperor.

While the Balkans argue about plenty, they rarely argue about who may sit on a throne purely because of their sex. And Japan, one of the world's most modern economies, in 2026 consciously chose tradition over arithmetic. The question is not whether the line will survive - it is how long a state can keep pretending the numbers do not apply to it.