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A cartoonist takes Japan’s new imperial succession law to court over male-only heirs

Kobayashi says the adoption system violates equality guarantees and blocks Princess Aiko from the throne.

  • On Saturday, Japan's revised Imperial House Law took effect, prompting manga artist Kobayashi to file a lawsuit at the Tokyo District Court challenging the male-only succession rules.
  • Kobayashi calls the measure the "Aiko-sama exclusion law," as it prevents Princess Aiko from succeeding her father, Emperor Naruhito, preserving male-only succession introduced in the 1890 Imperial House Law.
  • The legislation allows adopting unmarried male descendants from four former branch families, though critics note these individuals are at least 36 generations removed from Naruhito after splitting from a common ancestor 600 years ago.
  • Prime Minister Sanae Takaichi maintains only the paternal bloodline confers imperial legitimacy, yet legal experts have questioned the adoption system's constitutionality. Kobayashi's lawyer, Rintaro Kuramochi, acknowledges winning the case remains difficult.
  • Critics argue the adoption system undermines the constitution, while the government maintains the 1,500-year-old monarchy requires male-only succession. With no constitutional court in Japan, this lawsuit represents a rare legal challenge to the revised law.
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A cartoonist takes Japan’s new imperial succession law to court over male-only heirs

A popular Japanese cartoonist has sued the government over a revised imperial succession law. The law allows royals to adopt male relatives from former branch families to father future heirs.

·New York, United States
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On the 26th, manga artist Yoshinori Kobayashi filed a lawsuit against the government in the Tokyo District Court, seeking confirmation that the revised Imperial House Law, which would allow the adoption of male descendants of former imperial families who have renounced their imperial status, violates Article 14 of the Constitution, which prohibits discrimination based on lineage, and is seeking damages.

·Japan
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産経ニュース broke the news in Japan on Monday, October 26, 2026.
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