One day, the world is covered in cloud-like creatures called "Mokumo."

Most people went about their lives without questioning that fact.

At the same time, girls with mysterious powers that can clear away the clouds, called "Parasol Girls," began to appear. Without knowing each other, they all used their powers for their own gain.

One of them is a girl named "Rain" known as the Parasol Girl, but a little fairy named "Mel" blooms from the flower she is growing. The two's mysterious encounter and Mel's mission are the beginning of a big, never-ending journey to clear this covered world.