In the isolated island of Hope, tall buildings and modern technologies are their best assets. The island is protected by modern weapon systems. Why they have these? Because what lies beyond the ocean are dangerous. Monsters always come from the land across the ocean, but they never knew what was really there. They never knew why these monsters appeared all of sudden that's why over the centuries, they invented a lot of modern weapon against these creatures in attempt to drive them away. They even trained a lot of kids to become warriors that defend the lands of humans. These warriors dedicate their lives to save humanity from extinction. They are called the Warriors of Humanity.