Yuki Hayama works at Luna Bookstore, a small shop in town, and is an avid reader who dreams of becoming a heroic warrior of justice. Every day, while working her part-time job, she fantasizes about transforming into a heroine and defeating villains plotting to conquer Earth. One day, a customer asks her if she has a rare book called "Grimoran Genesis"—only for her to discover he is actually the evil Libronger. As he attacks her, she is introduced to the mysterious ancient tome, "Grimoran Genesis," a book with the supernatural power to make reality from any new text written on its final page. The Kutraruu Clan seeks to use this book to dominate the world, but a new warrior emerges to stop them. Empowered by the spirit of Rafreshian and her own love for books, Yuki transforms into Vermilia! Her battle against evil ultimately leads to a blissful conclusion [HAPPY END].