KORIYAMA, Japan (AP) — Britain's Prince William is spending the latter half of his four-day stay in Japan, starting Saturday, in the country's tsunami-ravaged northeast, a visit certain to draw global attention to the stories of survival and continuing suffering in the region. During his stay in Tokyo, which began Thursday, William visited with the cast of a samurai TV show, performed a good-luck sake-barrel-breaking ceremony at a shopping mall and had tea with Japan's crown prince. The media in Japan, a culture that traditionally values male heirs, have been referring to him as "Diana's first-born son," as though that was more important than his being second in line to the throne. William's trip to the tsunami-devastated northeastern region, relatively unusual for visiting foreign dignitaries, follows in the path of his mother's humanitarian efforts. Abe has been eager to spread the message that the nuclear disaster has been brought under control, although some say problems remain with contamination from radiation and continuing leaks at the reactors. On Friday evening, at a banquet in honor of William at the British Embassy in Tokyo, a sumo wrestler "yokozuna," or grand champion, who ranks at the top of the traditional sport of burly fighters, arrived in style — in a Bentley. [...] Saturday, William visited with the cast of a samurai drama show at Tokyo TV broadcaster NHK and tried on the glittering helmet and red kimono coat of a shogun samurai. At NHK, William also watched, and was visibly moved by, footage shot by helicopters of the 2011 earthquake and tsunami that showed homes, roads and cars being swept by towering waters.