Question: Akihito, the current Emperor of Japan, visited Afghanistan in 1971 with whom?

Context paragraphs:
Prince Kuni Asaakira: Prince Kuni Asaakira (久邇宮 朝融王 , Kuni-no-miya Asaakira-ō , 2 February 1901 – 7 December 1959) , was third head of the Kuni-no-miya, a collateral branch of the Japanese imperial family and vice admiral in the Japanese Imperial Navy during World War II.  He was the elder brother of Empress Kojun (Nagako), the consort of Emperor Shōwa (Hirohito), and thus a maternal uncle to the current Emperor Akihito.

Greenery Day: The present observation of Greenery Day (みどりの日 , Midori no Hi ) as a national holiday in Japan stems from the celebration of the Emperor Shōwa's birthday on April 29 every year during the Shōwa era.  In 1989, following the ascension of the current Emperor Akihito to the Chrysanthemum Throne, the name of the holiday was changed from "Birthday of the Emperor" to "Greenery Day".  Officially, as its name suggests, it is a day to commune with nature and to be thankful for blessings.  The day was renamed to "Greenery Day" to acknowledge the controversial wartime emperor's love for plants without directly mentioning his name.  However, in practice it is seen as just another day that expands the Japanese Golden Week vacation.

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).

Bahá'í Faith in Afghanistan: The Bahá'í Faith in Afghanistan was introduced in 1880s when some Baha'is visited Afghanistan.  However, it wasn't until the 1930s that a Bahá'í community was established there.  The first Bahá'í administrative institution Local Spiritual Assembly was elected in 1948 in Kabul and then was re-elected in 1969.  Though the population had perhaps reached thousands, under the Soviet invasion of Afghanistan and the harsh rule of the Taliban the Bahá'ís lost the right to have any institutions and many fled.  Although the Association of Religion Data Archives estimated there were some 15000 Bahá'ís in 2005, the Bahá'ís in Afghanistan number at approximately 400 according to a more recent 2007 US estimate.

Afghanistan–Japan relations: Diplomatic relations between Afghanistan and Japan (Pashto: د افغانستان او جاپان اړیکې‎ , Japanese: 日本とアフガニスタンの関係 ) were established in 1931.  In 1971, Crown Prince Akihito and Princess Michiko visited Afghanistan.  After the Soviet invasion in 1979, Japan closed down its embassy and did not recognize any of the warring factions.  In 2002 Japan reopened the embassy in Kabul.  Since then, Japan has engaged in various types of assistance to Afghanistan.

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.

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.

Hindu and Buddhist heritage of Afghanistan: Before the Islamic conquest of Afghanistan communities of various religious and ethnic background lived in the land.  South of the Hindu Kush was ruled by the Zunbil and Kabul Shahi rulers.  When the Chinese travellers (Faxian, Song Yun, Xuanzang, Wang-hiuon-tso, Huan-Tchao, and Wou-Kong) visited Afghanistan between 399 and 751 AD, they mentioned that Buddhism was practiced in different areas between the Amu Darya (Oxus River) in the north and the Indus River in the south.  The land was ruled by the Kushans followed by the Hephthalites during these visits.  It is reported that the Hephthalites were fervent followers of medieval Hinduism, and that they worshipped Hindu aspects of God, known as Shiva and Vishnu, as well as Surya.

Shōzō Uchii: Shōzō Uchii (内井 昭蔵 , Shōzō Uchii ) was a Japanese architect and academic authority on the works of Frank Lloyd Wright.  Known for the design of landmark structures such as the Setagaya Art Museum, Oita City Museum of Art, and the private residence on the grounds of the Tokyo Imperial Palace for the current Emperor of Japan, Akihito.

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.

Supporting paragraphs: Afghanistan–Japan relations Empress Michiko
Answer: Princess Michiko