Britain's Prince William (2nd L), Duke of Cambridge, receives a briefing from Aston Martin CEO Andy Palmer (L) next to an Aston Martin Rapide S car as he visits the Tsutaya bookstore Daikanyama in Tokyo, February 28, 2015. [Photo/Agencies]

As well as showcasing some stunning Aston Martin cars, the building itself had half of its facade redone to coolly incorporate and display the Union Jack in its structure.

"It would be wonderful if the Duchess of Cambridge and their two children (the Duchess is currently expecting her second child hence her absence from the royal Far East Tour), could accompany the Duke the next time they visit Japan, that would be the perfect Royal Family visit," remarked Tomikawa.

"But as a solo-visit, with an expectant wife at home and having just heard from Kensington Palace that after 14 exams, he will now be working as an East Anglian Air Ambulance pilot, I think he's done a remarkable job here as a British ambassador and we (Japanese) have been delighted to host him."

"As well as being an exemplary prince and ambassador for Britain, seeing him with the children in Fukushima shows us that, like his mother, he's just a very, very, decent human being," said Tomikawa, adding that she has been following the British Royal Family since Princess Diana married Prince Charles, hence her encyclopedic knowledge of the family.

"He may not be an astronaut yet, but flying helicopters is a step in the right direction," she quipped.

The prince's four-day trip will conclude on Sunday, when he is scheduled to travel to China.