Eiri is an art student who makes money by working in an antique ship, where he comes across a curious mirror. When he looks into it, instead of seeing his reflection, he is witness to the life of a young and beautiful blonde girl, Cossette. He becomes entranced by the events in the mirror, where Cossette has been waiting for over two centuries for someone to see her trapped in the glass. Eiri undertakes to help her any way he can, but little does he realize that doing so will lead down a horrific path, instigated by Cossette herself.