On Sunday, Iwayama watched as a gate blocking access to his home in Katsurao's Noyuki district was reopened at 8 a.m. local time. Evacuation orders for most of the village were lifted in June 2016, allowing registered residents to come and go, said a village official, who declined to be identified as is customary in Japan. Most who have returned since 2016 are senior citizens.

Some households however, are still waiting for their sections of the village to be decontaminated, according to the official.

Japan's Prime Minister Fumio Kishida said this month the opening would be the first time residents were allowed to live again in Katsurao's Noyuki district, dubbed the "difficult-to-return" zone, an area with high levels of radiation up to 50 millisieverts.

International safety watchdogs recommend annual doses of radiation are kept below 20 millisieverts, the equivalent of two full-body CT scans.

The Japanese government concluded that radiation levels had fallen sufficiently for residents to return, though the figure hasn't been released.

For now, just four households out of 30 said they intend to return to the Noyuki district, said the village official.

Before the disaster, Katsurao village had a population of around 1,500 people. Many of those who left have rebuilt their lives elsewhere, the official said.

As of March 2020, only 2.4% of Fukushima prefecture remained off-limits to residents, with even parts of that area accessible for short visits, according to Japan's Ministry of Environment.

But there remains more work to be done.

The Katsurao village official said about 337 square kilometers of land in seven Fukushima municipalities are deemed "difficult-to-return" zones. Of those, just 27 square kilometers in six of the same municipalities are specified reconstruction zones.

"This means that more work is needed and other families are waiting for the areas they used to live in to be decontaminated and restored to normal," he said.

Later this month, restrictions are expected to be partially lifted on Futaba and neighboring Okuma -- towns home to the Fukushima Daiichi nuclear power plant -- and a similar easing is scheduled in a further three municipalities in 2023, the official said. He added that a timeline for areas outside the reconstruction bases has not been decided.

"This is one milestone," Hiroshi Shinoki, the mayor of Katsurao village, told reporters on Sunday. "It is our duty to try and bring things back as much as we can to how they were 11 years ago."

Shinoki said that he wanted to revitalize local agriculture -- a key industry in the area -- to entice residents back.

"It feels like people have forgotten about Fukushima -- but we're still recovering," said resident Iwayama. "Our rice, fruits and vegetables are normal...we'd like people to know this produce is safe," he said.