Always assessing the roles of those around her, Hatori Matsuzaki has always viewed herself as the main character, making it only natural that she sees herself as the heroine for her crush and childhood friend, Rita Terasaka. Despite him having girlfriends, she is convinced that she is the only "right" person for him and that they will eventually end up together. This is the narrative Hatori has followed throughout her life. However, her entire world is thrown into chaos when Rita begins paying attention to their classmate Miho Adachi, a plain and unassuming wallflower, and they soon start dating. Hatori begins to question the nature of her reality: has she been the side character all along?