“For me, Kei-san is a priceless person.
Mako earlier declined a 140 million yen payment to which she was entitled for leaving the imperial family, palace officials said.
Mako, who turned 30 three days before the marriage, is a niece of Emperor Naruhito.
On Tuesday morning, Mako left the palace wearing a pale blue dress and holding a bouquet.
The couple did not answer questions at the news conference as Mako had expressed unease about responding in person.
The dispute involves whether money his mother received from her former fiancé was a loan or a gift.
Komuro, 30, left for New York in 2018 to study law and only returned to Japan last month.
The male-only succession practice leaves only Akishino and his son, Prince Hisahito, in line to succeed Emperor Naruhito.