The Duke of Cambridge is now on his way to China after a three day trip to Japan.
Earlier Prince William visited a Japanese coastal city to learn how communities coped with the devastating 2011 tsunami.
William toured Ishinomaki where more than 3,000 died and around 22,000 lost their homes when the city was deluged by a 28ft wave.
Prince William showed off his juggling skills during his visit to Japan - and proved he was rather good.
The Duke of Cambridge was also pelted with plastic balls as he played with children at an adventure playground in Motomiya City, the smallest town in Fukushima.
Japan's Prime Minister Shinzo Abe accompanied the Prince on his visit.
Since the Fukushima nuclear disaster in March 2011 - the largest since Chernobyl - many towns which were evacuated remain empty.
But the Prince visited a charity called Smile Kids, which aims to make the air and water around Fukushima safe.
Prince William was greeted by screaming crowds eager to get a glimpse of him as he visited a bookshop on the third day of his Japanese tour.
Crowds held up pictures of William and Kate, while one woman showed off a painting of the royal couple and Prince George.
And even their dogs got into the British spirit.
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Prince William met with Emperor Akihito and his wife Empress Michiko at the Gosho imperial residence, bowing from the neck to both of them.
He arrived in a chauffeur driven car and was met by the royal couple outside the residence in Tokyo.
Addressing them in turn as "your majesty", the Prince told Akihito, who he last met in 2012 during the Queen's Diamond Jubilee Sovereign Monarchs' lunch: "Your majesty, it's very nice to see you again. Thank you for having me here - fantastic."
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Prince William is in Japan for his first ever visit. He was taken on a tour of the capital's harbour before enjoying a traditional tea ceremony.
Royal Editor Tim Ewart reports:
The Duke of Cambridge has experienced a simple but spiritual Japanese tea ceremony to mark his arrival in the Far East country.
William who is making his first trip to Japan, was served tea by a grand master who has performed the ritual for his parents the Prince and Princess of Wales, and the Queen.
The second-in-line to the throne was taken to a centuries-old Tokyo teahouse and seated at a small table where he received the green tea, which is said to have life-prolonging properties.