Japan's Princess Aiko (R), accompanied by her father Crown Prince Naruhito, arrives at the Gakushuin Kindergarten to attend the open house classes on the father's visiting day in Tokyo June 18, 2006. (Xinhua/AFP photo)

Japan's Princess Aiko (R), accompanied by her father Crown Prince Naruhito, arrives at the Gakushuin Kindergarten on the father's visiting day in Tokyo June 18, 2006.  (Xinhua/AFP photo)