Eiji Kitahama shares a dream common among many high school boys: to become popular and have a harem of girls fawning over him. Fortunately, his new junior in the drama club, Rin Nanakura, has decided to help him realize this wish. Using her impressive acting abilities, she adopts various personalities, ranging from teasing to calm and collected, to play characters in Eiji's simulated harem. As her connection with Eiji deepens, Rin expands her repertoire, quickly switching between characters while enjoying high school life together in the club. Through her acting, the real Rin Nanakura does her best to win Eiji's heart.