Yuu Watase - Fushigi Yûgi. volume 2

Yui Hongo, Miaka's best friend in real life, who had also been transported into the book, briefly returns to her world. Due to a series of misunderstandings and traumatic experiences, Yui becomes bitter, believing that Miaka abandoned her. She is subsequently manipulated by the rival kingdom, Kutou, and becomes the Priestess of Seiryu, vowing revenge against Miaka and becoming a romantic rival for Tamahome's affections. 

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