The powerful system, which produced sustained winds of 144 km/h (89 mph), moved away from Japan on Tuesday morning, prompting authorities to downgrade most heavy‑rain and landslide warnings, but the damage had already been done.
In Kanagawa’s coastal city of Yokosuka, torrential rain triggered multiple landslides; a flow of mud into a home killed a woman in her 60s, while police and firefighters continue to search for a couple in their 70s who are still missing.
Further south in Chiba prefecture, a series of landslides killed three people and left two others unaccounted for, according to local officials, adding to the death toll that now stands at four across the affected area.
Power outages remain widespread, with roughly 45,000 households still without electricity in Chiba on Tuesday morning and tens of thousands more across the greater Tokyo region still in the dark.
Air travel was also hit hard: Japan Airlines cancelled 135 flights and All Nippon Airways scrapped 140, while the Fire and Disaster Management Agency urged about 1.6 million residents in and around Tokyo to evacuate, though the orders were not mandatory.
Dujuan dumped record rainfall as it weakened moving north‑eastward, delivering 832 mm of rain over 48 hours on Oshima Island, more than double the average September total, and a 24‑hour record of 282.5 mm in Tokyo’s Edogawa ward.
Japan regularly experiences strong typhoons in late summer and early autumn, but scientists warn that climate change is intensifying heavy‑rain events by allowing a warmer atmosphere to hold more moisture, making storms like Dujuan part of a broader pattern of extreme weather seen worldwide this year.