Typhoon Hagibis crashed into the country on Saturday night, unleashing high winds and torrential rain across 36 of the country's 47 prefectures, and triggering landslides and catastrophic flooding.
More than 100,000 rescuers, including 31,000 troops, were working into the night to reach people trapped after torrential rain caused landslides and filled rivers until they burst their banks.
Rescue workers waded through muddy, waist-high waters on Monday searching for missing people after one of the worst typhoons to hit Japan in recent history, with rain forecast to resume later in the day.
The death toll in the worst typhoon to hit Japan for decades climbed to 66 on Tuesday as rescuers slogged through mud and debris in an increasingly grim search for the missing, and as thousands of homes remained without power or water.
Rescue workers in Japan searched for the missing on Wednesday as the death toll from one of the worst typhoons to hit the country rose to 74, public broadcaster NHK said, many drowned by flooding after scores of rivers burst their banks.
Japan is bracing for an approaching super typhoon that is on track to hit central and eastern regions over the three-day weekend with potential damage from torrential rains and strong winds.
Hagibis kills at least two people and prompts authorities to issue their highest level of disaster warning over "unprecedented" downpours that caused flooding and landslides.
For a four-decade-old Philippine disco band, the namesake supertyphoon bearing down on Japan has brought a sudden rush of interest in its macho act.
Hundreds of flights in and out across the mainland were cancelled. Some bridges and railroad sections were shut down, thousands of fishing boats and other vessels were moved to safety, and more than 2,600 residents in the southern mainland regions were evacuated due to the possibility of landslides and other concerns.