Tokyo confirmed an additional 292 coronavirus infections on Sunday, down from the record-breaking increases of recent days.
Of the total, 203 are in their 20s and 30s, or 70%, health officials said.
Japan has been seeing a resurgence of the virus since the central government fully lifted a state of emergency in late May, with Tokyo and some other prefectures being forced to reimpose restrictions on some businesses in an effort to prevent a further spread of infections.
The daily figures announced by the metropolitan government reflect the most recent totals reported by health authorities and medical institutions in the capital.
The metropolitan government has raised its alert for the pandemic to the highest of the four levels, meaning "infections are spreading," with Gov Yuriko Koike warning that Tokyo may declare an emergency for the capital.
It has requested that karaoke parlors and establishments serving alcohol close by 10 p.m., effective from Monday through the end of August, to mitigate the spread of the virus.
Other prefectures including Osaka, Aichi and Okinawa are taking similar steps.
Okinawa declared an emergency on Saturday amid a growing number of infections including those reported at U.S. military bases in the island prefecture.As of Saturday night, the death toll stood at 1,026.
No deaths due to coronavirus were reported Sunday.© KYODO