The story takes place in an overhead world - "mystery" This is a unique world that combines ancient civilization and future science and technology. The domain is divided into five major domains, each with its own unique culture and powerful power system. Science and technology and practice coexist here, and the highly developed combination of machinery and spirituality has given birth to a powerful "psionic person" With "Technology Warriors"
The protagonist Li Han, born in the mysterious territory of Tianhan City, is a secret organization of orphans, because of talent is secretly cultivated as the organization's top assassin. He is good at using high-tech weapons and a combination of psychic forces in the way of combat, but in one mission, Li Han is betrayed by the organization, loses everything, and falls into a deep sleep. The story begins when he wakes up in an unknown place.