Concrete Genie takes place in a small port town named Denska. Once thriving, it has been abandoned after an oil spill caused by a tanker, along with it being slowly taken over by a force simply called Darkness, which stems from negative emotions. The story focuses on Ash, a young teenager who spends his time drawing on his sketchbook. He is frequently targeted by a group of bullies: Zack, Beatrice, Froggie, and siblings Chuck and Janie.