SLOGAN: "Delivery in the day, fighting monsters at night"
In 202020, humans call it is the geometric universe. In the ball planet , the protagonist: Shui Cheng'er (Naqua) daily works part-time at the "ZONE UNLIMITED" located in an old district. Naqua is responsible for delivering water, occasionally would deliver other stuffs.
One day, when Naqua is delivering water, she suddenly encounters the ancient water elf-Lami (Lami), afterward she finds who has extraordinary power, and is responsible for protect the precious resources of the ball planet.