Giant monsters known as Kaiju used to rule the Earth billions of years ago. However, when they suddenly emerge a decade ago and unleased destruction on the world, the survivors are forced onto an island that connected the mainland that have a mysterious effect to repel the Kaiju called the Sanctuary. However, the safety of the Sanctuary is threatened when the power to repel the Kaiju starts to weaken, and a mysterious declaration of war from someone who claims to be behind the attacks on the island forced the people to lose hope in their survival. And a man simply wants to forget the memories of the incident 10 years ago...