Relatives gather from afar in wintery Ashibetsu upon the death of patriarch Mitsuo. A mysterious woman named Nobuko suddenly shows up. Her appearance gradually exposes wartime secrets and Mitsuo's unknown past.

In the aftermath of the 2011 Tōhoku earthquake and tsunami, a journalist arrives in Nagaoka, a city decimated during a WWII air raid and by the 2004 Chūetsu earthquakes, to report on the disaster; there, she learns about the experiences of its inhabitants and stumbles upon a stage play written by an enigmatic student of her ex-boyfriend.