After losing her parents in an accident, Nina was taken in by the Roost family and has since been living as a stand-in for their daughter, Lilia. She endured this role, believing it was only until she graduated from the prestigious magic academy. However, when she receives a request to treat Prince Erland’s magic disorder, her life as a substitute takes an unexpected turn! Forced into a life of deception, Nina struggles through suffocating days… but she’s not one to back down so easily! With unwavering determination, she pushes forward—thus begins a magical academy fantasy!