Description：This is an adventure story of Rat and Wolf. Rat is the executor of the mission, while Wolf is the intermediary of the mission association, who is specifically looking for missions for Rat. While the two of them are constantly completing various difficult missions, Rat reveals his yearning for some indescribable things - the sea of stars; while Wolf is also looking for clues to his family's disappearance in various missions. The two learned from the missions that in addition to this world, there is a world above, and various signs indicate that Rat's yearning and Wolf's clues are pointing directly to the world above, or even a world above.