A shoe (C) that Yuna Kimura, a daughter of Norio Kimura, 50, who lost his father, wife and daughter in the March 11, 2011 tsunami, was wearing on the day of the disaster, is seen at a temple near Kimura's home inside the exclusion zone in Okuma, near Tokyo Electric Power Co's (TEPCO) tsunami-crippled Fukushima Daiichi nuclear power plant, Fukushima Prefecture, Japan, Feb 14, 2016. [Photo/Agencies]

The accident still hampers Kimura's effort to find Yuna, the last family member missing, as entry into half of his hometown, Okuma, is restricted due to high radiation levels.

On a recent weekend, Kimura and a dozen volunteers led by Ueno, combed through piles of debris on a windswept Okuma beach for any signs of Yuna. They are allowed to enter the area up to 30 times a year and stay for up to five hours per visit.