Princess Aiko, the only child of Japan’s Emperor Naruhito and Empress Masako, went through official ceremonies on Sunday to mark her coming-of-age as she was awarded the Grand Cordon of the Order of the Precious Crown at the Imperial Palace.The princess, who became an adult member of the imperial family when she turned 20 last Wednesday, earlier in the day visited sanctuaries that enshrine the family’s ancestors and Japanese gods to offer prayers.Dressed in formal wear, the princess stood…