Coppelion

Coppelion (コッペリオン, Kopperion) is a manga series written and illustrated by Tomonori Inoue. It was serialized in Weekly Young Magazine from June 9, 2008 to February 20, 2016. An anime adaption by GoHands aired from October 2, 2013 to December 25, 2013

Plot
In 2016 a meltdown of a nuclear power plant creates a big catastrophe in Tokyo. 20 years later, the city has become a ghost town due to the high levels of radiation. From that area a distress signal is received, the Self-Defense Forces dispatch 3 girls from the special unit Coppelion to search for survivors. But why aren't they wearing any protection against radiation?

Official

 * http://kc.kodansha.co.jp/