Japan's current state of emergency will be extended from Tuesday in nine prefectures, including Tokyo and Osaka.
The northern prefecture of Hokkaido confirmed 279 new infections on Monday.
That's the highest number reported in any prefecture, more than the figure in Tokyo.
Hokkaido also reported 19 deaths, its most ever for a single day.
Okinawa Prefecture in the south confirmed 142 new cases. It has reported more than 100 for 14 days in a row.
Okinawa Governor Tamaki Denny said, "The situation in Okinawa is dire...more than a week into the state of emergency. Infections keep spreading as variants replace the original strain."
Health authorities across Japan confirmed nearly 1,800 new cases on Monday and 80 deaths.
Japan is making further efforts to speed up its vaccination program. So far, it's inoculating people over the age of 65.
A central strategy has been opening large-scale sites... the latest being a Kobe football stadium. Eventually, officials hope to vaccinate 5,000 people every day.
Osaka's site has begun welcoming bookings from across the prefecture. The Defense Ministry runs the centers with the help of medical workers from the private sector.
They can now give out up to 10,000 shots a day in Tokyo and 5,000 in Osaka.
While the rollout is still limited to seniors and healthcare workers, Japan has now officially approved the Pfizer vaccine for people as young as 12.
The health ministry made the decision after reviewing data from clinical trials in the United States.
The ministry says parental consent will be required for children under 16.
The government has also decided to subject Vietnam and Malaysia to tighter entry measures due to the spread of coronavirus variants there.
People coming from those countries will have to stay at government-designated accommodations for six days upon arrival. The government plans to start the measure on Friday.