"Bibliophile Princess" is a romantic fantasy anime set in a fictional kingdom where books and knowledge hold significant cultural value. The narrative centers on Elianna Bernstein, a noblewoman with an insatiable love for books and a deep passion for learning. Her life takes a dramatic turn when she becomes engaged to Prince Christopher Selkirk Ashelard, the kingdom's crown prince. The engagement, initially a political arrangement, gradually evolves into a genuine relationship as the two navigate the complexities of court life and their growing feelings for one another.

Elianna's intellectual curiosity and resourcefulness often lead her to uncover hidden truths and solve mysteries that others overlook. Her unique perspective and love for literature frequently aid the prince in addressing political intrigue and threats to the kingdom. The story explores themes of trust, loyalty, and the power of knowledge, as Elianna and Christopher work together to protect their realm while deepening their bond.

The supporting cast includes figures such as Alexei Strasser, a loyal knight and confidant to the prince, and Lady Irene, a noblewoman whose actions often complicate the central relationship. The series balances moments of lighthearted romance with tension arising from court politics, external threats, and the challenges of maintaining a relationship under public scrutiny. Through its focus on Elianna's growth as both a scholar and a partner to the prince, "Bibliophile Princess" offers a blend of intellectual intrigue and heartfelt romance within a richly imagined historical fantasy setting.