Fushigi Yuugi: Eikouden

After years of hardships interfered with their love, Miaka Yuuki and Taka Sukunami are finally married and expecting a baby—the pinnacle of their unbreakable bond. Unfortunately, not everyone rejoices alongside the blessed couple. Mayo Sakaki, one of Taka's students, has a crush on him and cannot bear witnessing the pair's flourishing relationship.

Upon discovering The Universe of the Four Gods, Mayo learns that the old book is where Miaka and Taka first met as the priestess of the god Suzaku and the god's Celestial Warrior Tamahome. Unscrupulous about destroying a happy family, Mayo readily ventures inside with hopes of becoming the new priestess of Suzaku and rewriting the story to her advantage.

Meanwhile, her actions do not delay to show devastating effects. Leaving an unconscious Miaka at the hospital, Taka must follow Mayo to The Universe of the Four Gods and stop her before the circumstances worsen for his wife and their unborn child.