Question: Who is the only child of the Japanese princess born in 1963?

full_context: Document 1: Prince Nobuhiko Higashikuni: Prince Nobuhiko Higashikuni (b. 東久邇 信彦; 10 March 1945）is a Japanese aristocrat. The eldest grandson of Emperor Hirohito, he is the eldest son of Shigeko, Princess Teru (the eldest daughter of Emperor Hirohito, and eldest sister of present Emperor Akihito) and Prince Morihiro Higashikuni, a grandson of Emperor Meiji. He is nephew of reigning Emperor Akihito.
Document 2: Tōgū Palace: The Tōgū Palace (東宮御所 , Tōgū-gosho ) is located in the Akasaka Estate in Akasaka, Tokyo, and is the official residence of Crown Prince Naruhito, Crown Princess Masako and their daughter Princess Toshi.
Document 3: Masahito, Prince Hitachi: Masahito, Prince Hitachi (常陸宮正仁親王 , Hitachi-no-miya Masahito Shinnō , born 28 November 1935) is a member of the Imperial House of Japan and the younger brother of current Emperor Akihito. He is the second son and sixth born child of Emperor Shōwa and Empress Kōjun and is fourth in line to the Chrysanthemum Throne. Prince Hitachi is mainly known for philanthropic activities and his research on the causes of cancer.
Document 4: Aiko, Princess Toshi: Aiko, Princess Toshi (敬宮愛子内親王 , Toshi-no-miya Aiko Naishinnō , born 1 December 2001) is the only child of Crown Prince Naruhito and Crown Princess Masako of Japan.
Document 5: Princess Mako of Akishino: Princess Mako of Akishino (眞子内親王 , Mako Naishinnō , born 23 October 1991) is the first child and oldest daughter of Fumihito, Prince Akishino and Kiko, Princess Akishino, and a member of the Japanese Imperial Family. She is the eldest grandchild of Emperor Akihito and Empress Michiko.
Document 6: Prince Hisahito of Akishino: Prince Hisahito of Akishino (悠仁親王 , Hisahito Shinnō , born 6 September 2006) is the youngest child and only son of Fumihito, Prince Akishino and Kiko, Princess Akishino. He is the only grandson of Emperor Akihito and Empress Michiko. Hisahito is third in line to become Emperor of Japan, after his uncle Naruhito and his father.
Document 7: Masako, Crown Princess of Japan: Masako, Crown Princess of Japan (皇太子徳仁親王妃雅子 , Kōtaishi Naruhito Shinnōhi Masako ) , born Masako Owada (小和田雅子 , "Owada Masako" ) on 9 December 1963, is the wife of Naruhito, Crown Prince of Japan, who is the eldest son of Emperor Akihito and Empress Michiko and the heir apparent to the Chrysanthemum Throne. She is a member of the Imperial House of Japan through marriage. Should the Crown Prince ascend the throne as expected upon his father's abdication, Masako will become empress consort.
Document 8: Princess Masako Takeda: Princess Masako Takeda (恒久王妃昌子内親王 , Tsunehisa Ōhi Masako naishinnō ) , born Masako, Princess Tsune (常宮昌子内親王 , Tsune-no-miya Masako Naishinnō , 30 September 1888 – 8 March 1940) , was the tenth child and sixth daughter of Emperor Meiji of Japan and one of his consorts, Sono Sachiko.
Document 9: Masako Sen: Masako Sen (千容子 , Sen Masako , born 23 October 1951) , formerly Princess Masako of Mikasa (容子内親王 , Masako Naishinnō ) , is the fourth child and second daughter of Takahito, Prince Mikasa and Yuriko, Princess Mikasa. She married Soshitsu Sen on 14 October 1983. As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law.
Document 10: Empress Michiko: Michiko (美智子 ) , born Michiko Shōda (正田美智子 , Shōda Michiko ) on 20 October 1934, is the Empress of Japan as the wife of Akihito, the current Emperor of Japan reigning from 7 January 1989. She succeeded her mother-in-law, Empress Nagako (Kōjun), consort of Emperor Hirohito (Shōwa).
Document 11: Takako Shimazu: Takako Shimazu (島津貴子 , Shimazu Takako , born 2 March 1939) , born Takako, Princess Suga (清宮貴子内親王 , Suga-no-miya Takako Naishinnō ) , is a member of the Imperial House of Japan. She is the fifth and youngest daughter of Emperor Shōwa and Empress Kōjun, and the youngest sister of the current Emperor of Japan, Akihito. She married Hisanaga Shimazu on 3 March 1960. As a result, she gave up her imperial title and left the Japanese Imperial Family, as required by law.
Document 12: Fumihito, Prince Akishino: Fumihito, Prince Akishino (秋篠宮文仁親王 , Akishino-no-miya Fumihito Shinnō , born 30 November 1965) is a member of the Japanese imperial family. He is the younger son of Emperor Akihito and Empress Michiko and currently second in line to the Chrysanthemum Throne.
Document 13: Kiko, Princess Akishino: Kiko, Princess Akishino (文仁親王妃紀子 , Fumihito Shinnōhi Kiko ) , born 11 September 1966 as Kiko Kawashima (川嶋紀子 , "Kawashima Kiko" ) , is the wife of Fumihito, Prince Akishino, the second son of Emperor Akihito and Empress Michiko of Japan. She is also known as Princess Kiko.
Document 14: Hanako, Princess Hitachi: Hanako, Princess Hitachi (正仁親王妃華子 , Masahito Shinnōhi Hanako ) , born Hanako Tsugaru (津軽華子 , Tsugaru Hanako ) on 19 July 1940, is a member of the Japanese Imperial Family as the wife of Masahito, Prince Hitachi, who is the younger son of Emperor Shōwa and the only brother of the current emperor, Akihito.
Document 15: Princess Kako of Akishino: Princess Kako of Akishino (佳子内親王 , Kako Naishinnō , born 29 December 1994) is the second daughter of Fumihito, Prince Akishino and Kiko, Princess Akishino, and a member of the Japanese Imperial Family. She is the second-eldest grandchild of Emperor Akihito and Empress Michiko.
ground_truth: Aiko, Princess Toshi