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Aiko, Princess Toshi (敬宮愛子内親王, Toshi-no-miya Aiko Naishinnō, born 1 December 2001) is a member of the Japanese imperial family. She is the only child of Emperor Naruhito and Empress Masako of Japan.Following her birth, the ongoing Japanese imperial succession debate had resulted in some politicians holding a favorable view on rescinding agnatic primogeniture (male-only imperial succession) originally implemented in 1889 and reinforced by the World War II allies on the constitution of Japan. However, once her uncle and the current crown prince Fumihito had his son Hisahito in September 2006, he became next in the line of succession following his father. Aiko remains at present legally ineligible to inherit the throne, while debate about the possibility of having future empresses regnant continues.