A prominent Japanese cartoonist has taken legal action against the government over a recently revised imperial succession law, which upholds the male-only inheritance of the Chrysanthemum Throne. Yoshinori Kobayashi, known for his historical and monarchy-themed books, filed a lawsuit with the Tokyo District Court, arguing that the law violates Japan's constitution.
The revised law, which went into effect Saturday, permits unmarried male relatives from former imperial branch families to be adopted into the current imperial family to secure future heirs. This measure was implemented amid concerns about a dwindling number of male heirs in the direct line. Emperor Naruhito's younger brother, Akishino, and his nephew, Prince Hisahito, are the next in succession. However, there are no other eligible heirs in Hisahito's generation.
Kobayashi's lawsuit contends that the adoption of former royals, who are currently commoners, creates a discriminatory class system. He asserts this practice contravenes Article 14 of the constitution, which guarantees equality for all citizens, irrespective of social status or family origin. "The adoption would introduce a new class system of ‘former imperial branch family’ in Japan. ... It's a serious problem," Kobayashi stated to reporters.
The law also allows female members of the imperial family to retain their royal status after marrying commoners, but their husbands and children do not gain royal titles. This provision effectively excludes Emperor Naruhito's only child, Princess Aiko, from the line of succession, a point Kobayashi has publicly criticized, referring to the law as the “Aiko-sama exclusion law.”
Officials maintain that the adopted individuals must be male descendants, 15 years or older, from one of the four remaining former branch families. These families, who were stripped of their royal status in 1947, are descended from imperial relatives who split from a common male-line ancestor approximately 600 years ago. Critics question the proximity of these individuals to the current imperial line, arguing they are too distantly related to be considered true imperial kin.
The push for the male-only succession policy was notably supported by Sanae Takaichi, a conservative member of Prime Minister Fumio Kishida's government, who has argued that only a patrilineal bloodline confers legitimacy upon the emperor.
Legal experts, including members of a government panel on imperial succession, have also voiced reservations regarding the constitutionality of the adoption clause. Kobayashi's lawyer, Rintaro Kuramochi, acknowledged the legal challenge will be difficult, but emphasized it is the only avenue available in Japan to contest the law, given the absence of a constitutional court and the current government's stance.
In addition to challenging the law's validity, Kobayashi is seeking 1 million yen (approximately $6,350) in damages for psychological distress. His legal action is rooted in his advocacy for equal rights and democratic values, themes often explored in his work. Japan's imperial monarchy has a long history, having had eight female rulers in the past. However, the principle of paternal-line male succession was formally established in the 1890 Imperial House Law during a period when patriarchal systems were being promoted in the nation.