Princess Mako, the first grandchild of Emperor Akihito, was congratulated by bystanders about her impending engagement to a former university classmate as she visited a Tokyo museum Monday to perform her first official duty since the news broke last week.

The 25-year-old princess, accompanied by her parents, Prince Akishino and Princess Kiko, arrived at the National Museum of Nature and Science in Ueno by car, bowing lightly to dozens of people who were awaiting their arrival.

"They're such a nice-looking couple and I'd like to see them together soon," a 48-year-old housewife from Koto Ward said excitedly after watching the Imperial trio enter the museum.