In a land where the sky is constantly filled with dark ash, raining down without end and covering the earth, humanity is gripped by terror. The ash is known to burn and melt away human flesh, leaving people with no option but to don protective suits and giant masks to cover their faces. Forced to retreat to the depths of the underground, these masked and bundled-up individuals struggle to survive in a world consumed by fear. "COCOLORS" tells the tale of the children who grew up in this dreadful realm.