Princess Mako, a niece of Japanese Emperor Naruhito, has expressed hope a statement her boyfriend released the previous day to address a monetary dispute involving his mother will help gain more public understanding of his stance, her aide said Friday.

In the document, Kei Komuro vowed to "correct erroneous information" regarding the dispute, which has gotten in the way of a planned marriage between the princess and him.

Combined photo shows Japanese Princess Mako (R) and her boyfriend Kei Komuro. (Kyodo)

"I would appreciate if people could understand there were various circumstances (behind the dispute) by reading the document," Princess Mako was quoted as saying by an Imperial Household Agency official.

In the 24-page statement, the boyfriend expressed his resolve to tie the knot with the princess. The document, which was released after Komuro consulted with Princess Mako, also reflects her thoughts on the matter, according to the official.

The planned marriage between the couple, both 29, has been postponed for over two years following reports of trouble between his mother and her former fiance over money, including Komuro's educational expenses, which the man shouldered.

The princess' father, Crown Prince Fumihito, 55, the emperor's younger brother, has said he approves of the couple's marriage but urged the Komuros to make a visible effort to resolve the dispute.

In the latest document, Komuro said he believes a settlement through talks between his mother and the man would be "the best choice," but efforts to bridge the gap over the problem through their negotiations between May 2019 and November 2020 "broke down."

Komuro, who has been studying at Fordham University's law school in New York since August 2018, and Princess Mako met when they were students at International Christian University in Tokyo.

In September 2017, they announced their intent to get engaged, with their wedding originally scheduled for November 2018.

But the Imperial Household Agency announced in February 2018 their marriage would be put off until 2020 following the reports of the dispute.

In November last year, Princess Mako expressed wishes to go ahead with the wedding, saying it is a "necessary choice" for them.

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