Ordinary girl Night Shadow became a civil servant after graduating from college and left her parents to live alone. One day, after accidentally meeting an old man, she begins to take a completely different path from her past. An item given by the old man made her constantly encounter in another space. Because of her continuous learning, she not only mastered all the skills and crafts, but also lived a prosperous life in another space. And these skills and crafts are also brought back to the real world, making her an awesome presence in the real world. She is quiet and unassuming by nature, even if she is a living being looked up to in two different worlds, she is still mysterious, everyone only knows her name Phantom, and only hears her terrifying legend...