Do you ever wonder what your life's purpose is? Is life just a never-ending cycle of birth and death? Perhaps you question if you have any real sense of direction in this world. For Nao, a college student plagued by these thoughts, reality is harsh. Since he was young, he's been deemed a "ghost boy" with such a weak presence that he's gone unnoticed by most. One day, after being tormented by a child at a family diner, Nao reaches his breaking point and poisons the child. The police interrogate him, but suddenly, a mysterious and attractive woman shows up and saves him. She asks him a question: "Would you like to rule the world with me?"