Princess Aiko, the daughter of Emperor Naruhito and Empress Masako, turned 21 on Thursday.
The Princess has been performing official duties as an adult member of the Imperial family since coming of age last year.
Princess Aiko, the daughter of Japan's Emperor and Empress, turned 19 on Tuesday.
The princess enrolled in Gakushuin University in April.
Princess Aiko, the daughter of Japan's Emperor and Empress, has attended her graduation ceremony at Gakushuin Girls' Senior High School in Tokyo.
The princess was wearing a facemask as she appeared at the school on Sunday for a scaled-down ceremony amid the spread of the new coronavirus.
A final group of passengers and crew members who disembarked from the coronavirus-hit Diamond Princess cruise ship finished their quarantine on Sunday. They will now be allowed to go home.
All passengers and crew members had left the ship moored at Yokohama Port by March 1.
Japan's health ministry plans to review its handling of coronavirus infections on the cruise ship Diamond Princess.
At a news conference on Sunday, health minister Katsunobu Kato said the ministry has collected necessary data and will choose an appropriate time for the review, while keeping a close watch on the outbreak in Japan.
The final group of people on the Diamond Princess cruise ship quarantined at Yokohama Port, near Tokyo, disembarked on Sunday.
Crew members who had tested negative for the new coronavirus began disembarking on Thursday.
Crew members aboard the quarantined ship docked near Tokyo began disembarking Thursday. Those without symptoms will be quarantined and undergo medical checkups for 14 days.
It will take about 3 days for the approximately 240 crew members to disembark. Most of them are non-Japanese. They will leave Japan after the two-week period if they test negative.
Japan's health ministry says a third passenger from the quarantined Diamond Princess has died. The cause of death was pneumonia.
The ministry did not disclose whether the man in his 80s had been infected with the new coronavirus.
Japanese authorities say 57 more people on board the quarantined Diamond Princess have tested positive for the new coronavirus.
This brings the total number of virus carriers found on the cruise ship to 691.
Two passengers from the Diamond Princess have died after being infected with the new coronavirus. They are the first fatalities among the passengers and crew of the quarantined ship docked at Yokohama Port, near Tokyo.
Japanese government officials say an 87-year-old man and an 84-year-old woman, both Japanese, died on Thursday. Health ministry officials are looking into the infection routes.
Passengers continue to disembark from the quarantined cruise ship docked at Yokohama Port.
As of Wednesday, a total of 621 passengers and crew members on the Diamond Princess had tested positive for the new coronavirus.
A Japanese doctor dealing with the new coronavirus outbreak on the cruise ship quarantined near Tokyo has described his work on board.
Doctor Mineo Matsubara has been on the Diamond Princess since February 13 as a member of the Disaster Medical Assistance Team, or DMAT.
Passengers aboard a cruise ship south of Tokyo are finally starting to go home, after spending two weeks in quarantine. NHK World's Haruka Nouchi filed this report from Yokohama Port.
NOUCHI: It's been a busy morning at Yokohama port.
Japanese health officials say 88 more people on a quarantined cruise ship have tested positive for the new coronavirus, bringing the total number of confirmed cases from the ship to 542.
Health ministry officials say that of those recently confirmed infected, 65 are not showing any symptoms.