In this world, demons threaten to emerge from corrupted hearts. To protect everyone, each person's chest is installed with a Heartlock with varying degrees of security. But young Louis can afford only the simplest of Heartlock since he has no money or privilege. After his innermost desires are exposed by his closest friend, he is framed and sent away. Surrounded by the demons of other tormented inmates, can the innocent Louis and his delicate heart survive this new hell?