nhk world's keiko yamamoto has the details. >> reporter: prince william is spending some of his time looking back at the past. he saw row after row of war groves near tokyo. this is a final resting place for 700 commonwealth service members. they died after being taken prisoner by the now-defunct japanese empirical army in world war ii. the prince paused here to reflect and prayed silently. he took time to pay a visit to emperor and empress at the imperial palace. he's following in the footsteps of his parents prince charles and princess diana who came to japan 29 years ago. nearly 100,000 people are said to have come to see the couple's motorcade in tokyo. the princess started a feminine phenomenal known as diana fever. the prince's grandmother queen elizabeth visited japan in 1975. at that time, the queen toured nhk's studios that were used for historical dramas. as a young royal family member prince william is expected to build a bridge between both countries and also between tradition and the future. and that's what he did at this conference in promoting british innovation. deleg

nhk world's keiko yamamoto has more. >> reporter: kenji goto covered numerous wars over his career. he described how vulnerable ordinary people in war. especially children. and the high price they often pay. goto eventually traveled to syria, and was captured by islamic state militants. last month, they claimed they had killed him. another freelance journalist yamamoto died in a shoot-out three years ago. she had also gone to syria to cover the civil war. her reporting shed light on the lives of people living in conflict zones. participants in the symposium who knew yamamoto and goto spoke about journalist contributions during war. >> translator: there are so many things that wouldn't be reported if journalists stayed put. >> translator: i think the more people who report on the same conflict the clearer the picture becomes. you begin to get a more three dimensional idea of what's taking place. >> reporter: sato had worked with yamamoto covering conflicts. he shared the words that she lived by. >> translator: she always said it's impossible to silence the voices of every journalist.