The small town, or rather the village, of Futaba before the 2011 earthquake and meltdown had approximately 5,600 inhabitants.
Since then, it has been included in the closed areas, while careful clean-up work has been carried out.
The cleanup costs many billions and is not yet complete.
But last year, the authorities approved allowing people to move back to Futaba on a trial basis.
Only 15 people applied, and five of these have now arrived to inspect and move into their old quarters.
- It's flowing!
For the first time in ten years and eleven months, water is coming out of the tap here, says one of the volunteers on Japanese television as he tests the water supply at the site.
Earthquakes, tsunamis, meltdowns
The earthquake had a magnitude of 9.0 and triggered tsunamis that led to a meltdown at the Fukushima nuclear power plant.
It led to new concerns around the world about the dangers of nuclear power.
The quake and tidal waves left over 18,400 people dead or listed as missing.
The radiation from the meltdown meant that large areas of Fukushima Prefecture were cordoned off for years.
Last year, 2.4 percent of the prefecture still had an entry ban.