After the invading dimensional monsters were repelled, Seoul was rebuilt. This is the story of the CLOSERS in New Seoul. Mysterious dimensional gates opened across the planet, unleashing a worldwide invasion of dimensional monsters. No weapons or tactics could withstand the waves of dimensional monsters pouring from these gates. City after city was mercilessly destroyed. However, the opening of the dimensional gates did not only cause damage and destruction. The psychokinetic power they awakened also enabled a tiny minority of humans to gain extraordinary psychic abilities. With these psychic warriors, governments around the world were able to turn the tide of the war against these monsters. After unspeakable losses, the people of Earth at least succeeded in closing the gates. Since they had closed the gates, these psychics began to be called "CLOSERS," and the invasion of the dimensional monsters was named the First Dimensional War. With the dimensional monsters vanquished, peace returned to the world, and the cities were rebuilt. Through dedicated research into the dimensional gates and psychokinetic power, humans learned that the gates open when there is a singularity in this mysterious power. However, their understanding of the gates remained incomplete. The CLOSERS who survived the First Dimensional War became part of an organization called UNION. Together, they researched psychokinetic power all over the world, working to prevent another dimensional war. And that is when the dimensional gates all over the world started shaking again—as ever stronger outbreed creatures renewed their attack on Earth.