In post-war Japan, the nation struggles to rebuild from the devastation left by World War II. The country is fraught with lingering anxiety and economic hardship, and people are desperate to find hope amidst the ruins. Amidst this backdrop, a marine officer returns home, severely traumatized by his experiences during the war. Haunted by the decisions he was forced to make, he struggles to reintegrate into civilian life, feeling detached from both his family and society. As he attempts to find a semblance of normalcy, rumors of an unimaginable force lurking in the oceans spread across the country.

As tensions rise, this rumored threat finally emerges—a colossal creature with incredible destructive capabilities. The monstrosity's rampage across Japan only deepens the scars of conflict, pushing the nation into a new state of crisis. Desperate to protect their homeland, citizens and military forces are mobilized against this overwhelming power. Our protagonist must confront his own demons and unite with others to face this new menace. The challenge reignites a sense of urgency and camaraderie among the survivors who must make difficult moral choices in combating the creature's onslaught. As destruction looms large over the fragile society, individuals are forced to decide between their personal fears and the collective survival of their nation.