This study aimed to identify the causes and types of narcissistic personality disorder in the main character of Kaira Rouda's novel, "Best Day Ever" and hoped to provide a foundation for further research in this area. The data source for this study was the novel itself. Qualitative descriptive research methods were used to analyse the data with a psychological approach, including the techniques of reading, note-taking, and analysis. Caligor et al’s and Bursten's theories were used to classify the data. The results of this study reveal that the main character was a narcissist. he had 8 out of 9 signs of narcissistic personality disorder caused by excessive self-importance, fantasies of success, feelings of being special, excessive need for admiration, arrogance, and lack of empathy, and the main character's narcissistic personality disorder was predominantly of the manipulative type
                        
                        
                        
                        
                            
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