Read manga: Fushigi Yuugi: Genbu Kaiden

manga
Summary:

When schoolgirl Takiko Okuda attempts to destroy her father's translation of The Universe of the Four Gods, she is instead literally sucked into the story, becoming the Priestess of Genbu in an epic journey to find the seven Celestial Warriors!
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Also included is a side story (Ayashi no Ceres Gaiden) in vol. 6 that covers events after the end of the Ayashi no Ceres series where Aya dreams of Ceres' past.