Fourteen villages were inundated as a tidal surge breached flood dams. The dead included a minor in Barguna district on the coast and five others killed by lightening.
India has evacuated more than a million people living along its east coast ahead of an extremely severe cyclone that is due to make landfall on Friday afternoon, government officials said.
Japan will for the first time next month lift an evacuation order in one of two towns where the crippled Fukushima nuclear plant is located, officials said on Tuesday.
Despite the orders, just 3,000 people were in shelters in the Kagoshima region on Thursday morning, an official tally showed.
Due to the heavy rains that have been lashing the region in recent days, authorities have ordered the evacuation of 600,000 people in the southwestern city of Kagoshima, Japan.