Spring, 1941. Sixteen-year-old Toshihiko attends school in the coastal town of Karatsu, where his aunt cares for his ailing cousin. Immersed in the seaside's nature and culture, Toshihiko soon befriends the town's other extraordinary adolescents as they all contend with the war's gravitational pull.
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.
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.
