Princess Kako, the younger daughter of Crown Prince Fumihito and Crown Princess Kiko, is planning to visit Austria and Hungary in September in her first official overseas trip, the Imperial Household Agency said Thursday.The 24-year-old princess is expected to attend memorial events and also make courtesy visits to the presidents of the two countries as Japan marks this year the 150th anniversary of establishing diplomatic ties with them, the agency said.The princess, a niece of new Emperor Naruhito and Empress Masako, graduated this spring from the International Christian University in Tok…READ FULL ARTICLE