The series plays out in the Onahama district in Iwaki, in the Fukushima prefecture's coastal region.<br><br> It follows the personifications of two WW2 japanese warships, Shiokaze and Sawakaze, who worked as breakwaters in Onahama Port. In this fictional story, the 2011 earthquake pierces a worm hole in the spacetime continuum, starting an invasion from another dimension.