"Fushigi Yugi Eikoden" is a three-episode OVA sequel to the original "Fushigi Yugi" series, serving as a continuation of the story set in the Universe of the Four Gods. The narrative takes place several years after the events of the original series, focusing on the next generation of characters while revisiting the fates of the original cast. The protagonist, Suzuno Osugi, is a high school student who discovers the mystical book "The Universe of the Four Gods" in her school library. Upon opening it, she is transported to the world within the book, where she is revealed to be the Priestess of Seiryuu, one of the four celestial guardians.

In this world, Suzuno encounters the Seiryuu Seven, a group of warriors bound to protect the Priestess of Seiryuu. These warriors include Suboshi, Amiboshi, and others, who are reincarnations or descendants of the original Seiryuu warriors. Suzuno's arrival reignites the conflict between the Seiryuu and Suzaku factions, as her presence threatens the balance of power. The story explores her struggle to understand her role as the Priestess while grappling with the weight of her responsibilities and the moral complexities of the world she has entered.

The OVA also revisits the original characters, such as Miaka Yuki and Taka (Tamahome), who have settled into their lives after the events of the first series. Their involvement provides a bridge between the past and present, offering context and emotional depth to Suzuno's journey. Themes of destiny, sacrifice, and the cyclical nature of conflict are central to the narrative, as Suzuno must navigate her path while confronting the lingering shadows of the original Priestess of Seiryuu, Yui Hongo.

The plot intertwines Suzuno's personal growth with the broader political and supernatural struggles of the Universe of the Four Gods. The Seiryuu Seven, each with their own motivations and backstories, play pivotal roles in shaping Suzuno's understanding of her mission. The OVA maintains a balance between action, drama, and character development, ensuring that the story remains engaging while expanding the lore of the "Fushigi Yugi" universe. By the conclusion, Suzuno's journey as the Priestess of Seiryuu reaches a resolution, though the OVA leaves room for reflection on the enduring impact of the choices made by both the new and original characters.