In the golden age of Cosmic Exploration, countless spaceships were created for the exploration through space. Similarly to the age of Exploration in 15th century to 18th century, explorers found new planets and species. Cultural and economical exchanges remarkably prospered, but invasion and plunder to the new planets also spreaded.
The prosperity of the cosmic exploration brought the gap between the rich and poor by the result of exploration. A girl, who lost her parents due to the spaceship plunder, became the collector to make money. The collectors are also known as space cleaner that trace missing or plundered spaceship and find junk parts, tools, or energy sources to sell them. She is one of them, and wander through space to find spaceship filled with treasure.
One day, her old navigator leads her to a broken gigantic spaceship that she never seen before. In the spaceship, she finds a fragment of treasure map and decides to sell it. While she moves toward to the planet of free trade, she is attacked by Space Corporation and Cosmic Union, which have kept watching on the broken spaceship. She barely escapes to her hideout, but she already gets involved in the Treasure War.