>> hate is the greatest destroyer of anyone. the idea that you can harbor hate will destroy you. >> reporter: it's that understanding the president celebrated at hiroshima. >> since that fateful day, we have made choices that give us hope. the united states and japan forged not only an alliance, but a friendship that has won far more for our people than we could ever claim through war. >> reporter: a message prime minister abe is certain to echo as he pays tribute at this watery grave, now a sacred sight. athena jones, cnn, honolulu, hawaii. >> is it an historic visit coming up. still ahead, they have waited years for fritsch. now 21 school girls are reunited with their families.