Three people died in two separate car crashes on highways surrounding Tokyo that police later closed to traffic. Three people in the city of Gunma died when a roof collapsed under pressure from the snow.
Tokyo has received 10 inches of snow, the fourth-largest accumulation in the post-World War II era, Kyodo News said. It's the second such storm in as many weeks to hit the area.
In Shiroishi, residents endured a record-setting 22 inches of snow. Neighboring Fukushima got 21 inches, officials said.
Thousands of travelers spent Friday night stranded in Tokyo's Haneda airport after mass flight cancellations.