After World War II, the Imperial family had princesses such as Imperial Princess Aiko, but no prince was born for about 40 years since the birth of Imperial Prince Akishinonomiya Fumihito and now no one could have the right to succeed to the Imperial throne.
第二次世界大戦後、愛子内親王などの皇族の女子が誕生する一方で、秋篠宮文仁親王誕生以降は悠仁親王の誕生まで約40年もの間皇族の男子が誕生せず、皇位継承の権利を持つ皇族の男子が不足している。