Japan's Emperor Naruhito and Empress Masako have invited leaders who attended the Tokyo International Conference on African Development, or TICAD, to a tea party at the Imperial Palace.
Leaders and their spouses from more than 30 African nations attended the event following the three-day conference on Friday.
Leaders from over 50 African countries, and officials from a range of international organizations are descending on the Japanese port city of Yokohama, for a three-day summit.
The Tokyo International Conference on African Development, TICAD, will begin soon with an opening address from Japanese Prime Minister Shinzo Abe.
Japanese Prime Minister Shinzo Abe says one of the main topics at the Group of Seven summit was the increasing uncertainty over the future of the global economy.
"With regard to the downside risks, we have agreed that we need to work together to carry out prompt and thorough measures to support the global economy," Abe said.
A daughter of the late Aum Shinrikyo cult leader Shoko Asahara has asked a court to decide who should take possession of his ashes.
Sources say the fourth daughter of Asahara, whose real name was Chizuo Matsumoto, filed the request with the Tokyo Family Court last December. She has said she wanted to be the keeper of his remains in line with her father's wishes.
Official campaigning is underway in Japan's Upper House election set for July 21. It may prove to be a barometer of public opinion on the current administration's six and a half years in power.
The ruling coalition consists of Prime Minister Shinzo Abe's Liberal Democratic Party and its junior partner, Komeito.
The leaders of the European Union have expressed concern over the intensifying trade friction between the United States and China, and stressed the importance of a rules-based trade system.
European Commission President Jean-Claude Juncker and European Council President Donald Tusk were speaking to reporters in Osaka ahead of the opening of the G20 summit on Friday.
World leaders are beginning to arrive in Osaka for the G20 summit, where trade tensions may complicate discussions.
Much ink has been spilled on the divisions between two prominent members, the US and China. But Japan's prime minister is using his position as summit chair to stress consensus over conflict.