In a world where gigantic fish are steadily encroaching upon human territory, humans either band together or exploit one another. The threat from the colossal fish has not diminished in the slightest; rather, the people one encounters are far from a source of relief and have become even more dangerous than before. The human instinct for survival prolongs suffering and agony, and the threat of the giant fish begins to evolve into something entirely unprecedented. Amidst this world, Hannah is surviving all alone, as if running away from something... or trying to clear her mind from a certain event. However, the world does not grant her the leisure to process her emotions.