Midorijima. Situated to the south of Japan, this beautiful island was once a place where people lived in harmony with nature. Then the Toue Corporation took over, driving off most of the island's residents and forcing those who would not leave to live in the shadow of Platinum Jail, a walled-off megaresort where the wealthy wallow in luxury.

Aoba is a young man living with his grandmother in the Old Residential District, the last refuge of Midorijima's people. While his peers join gangs and fight for dominance of the streets or immerse themselves in the virtual reality game Rhyme, Aoba works part-time at a junk shop and hopes only that his peaceful life will last. But strange things are happening on Midorijima, and Aoba will soon have to fight… or lose everything that he holds dear.