The final meeting between the two royal couples took place at Buckingham Palace on Thursday and comes towards the end of the 64-year-old emperor and Empress Masako's trip to Britain.
From the palace, the Japanese pair were due to head to the Young V&A, a museum in east London that celebrates childhood and creativity, and has an exhibition called Japan: Myths to Manga.
The King and Queen hosted a state banquet for Emperor Naruhito and Empress Masako. (AP PHOTO)
The pair were set to round off the public part of their stay at Britain's famous Royal Botanic Gardens in Kew, west London, which is home to the world's largest collection of more than 2.4 billion wild plant seeds including species from Japan.
There, they will tour the giant glass Temperate House, built in 1863 and home to thousands of different plants as well as see a display of bronze bonsai sculptures by British contemporary artist Marc Quinn.
The two heads of state have been highlighting the military, business and cultural ties between Britain and Japan over the course of the visit, which has taken place in the run up to Britain's general election on July 4.
Emperor Naruhito and Empress Masako visited the Young V&A Museum in east London. (AP PHOTO)
That has meant the emphasis has been on the royal family, and there has been no meeting at Downing Street between the emperor and Prime Minister Rishi Sunak.
Naruhito was also due to privately visit St George's Chapel at Windsor Castle on Thursday, to lay a wreath on the tomb of Queen Elizabeth.
He attended her funeral in 2022 and last week before his trip to London, he had spoken of his fondness for her and the kindness the British royals showed him when he came to Britain in the early 1980s to study.
The Japanese couple both studied at Oxford and will visit their respective colleges on Friday, before heading home.
