After the war, from 1947 to 1950, Mrs. Elizabeth Gray Vining tutored both princes and their sisters, the Princesses Kazuko, Atsuko, and Takako, in the English language.

The following day, Emperor Shōwa granted him the title Hitachi-no-miya (Prince Hitachi), and authorization to start a new branch of the Imperial Family in celebration of his wedding.

Most recently, Prince and Princess Hitachi visited Nicaragua and El Salvador, to mark the 70th anniversary of the establishment of diplomatic relations with both countries in October 2005.

They also made a visit to France in September 2007 and Peru, marking the celebration of 110 years since the establishment of a Japanese community in this country, June 2009.

[5][6] He was readmitted to hospital with a fever and loss of appetite on 2 April,[7] and was subsequently diagnosed with a urinary tract infection.