Princess Mako, the eldest grandchild of Emperor Akihito and Empress Michiko, will marry a former classmate at her university, the Imperial Household Agency announced in a much-anticipated news conference Sunday.

The princess and her fiance, Kei Komuro, both 25, described their relationship in a very romantic way, comparing it to that of the sun and moon.

"Together with Mr. Komuro, I would like to make a warm and peaceful family that is full of smiles," Princess Mako said at the news conference in Tokyo's Akasaka district, after the Emperor officially approved of their engagement during a ceremony Sunday morning.