It's the 23rd Century, and the Earth has shattered into millions of inhabitable floating blocks. The blocks are controlled by the Sphere, an evil dictatorship bent on dominating humankind. Among the people are seijins, humans with supernatural powers activated by sunlight. A young girl named Lena and her brother Mahad have escaped the Sphere and joined fellow rebel pirates in a fight against its oppression. Today, they represent the only hope for freedom. This is their story.