Prime Minister Shinzo Abe plans to meet key world figures who have been invited to attend Tuesday's enthronement ceremony for Emperor Naruhito.
Guests from more than 170 countries, territories and international organizations are scheduled to take part in Tuesday's ceremony when Emperor Naruhito will declare his accession to the throne.
Abe is scheduled to hold separate talks on Monday with guests from at least 10 nations and territories, including Spain's King Felipe the Sixth, and Myanmar's de facto leader Aung San Suu Kyi.
Schedule adjustments are being made for Abe and South Korean Prime Minister Lee Nak-yon to meet on Thursday.
Abe is expected to call on the South Korean government to work toward improving strained bilateral relations by taking concrete measures to settle the wartime labor issue.
Abe plans to hold talks with the guests through Friday, including German President Frank-Walter Steinmeier, and Philippine President Rodrigo Duterte.
Saudi Crown Prince Mohammed bin Salman and Israeli Prime Minister Benjamin Netanyahu have cancelled their attendance at the ceremony, and plan to send envoys on their behalf.