Set a century after the events of Fushigi Yuugi: Genbu Kaiden, Byakko Ibun follows Suzuno Osugi, the Priestess of Byakko, and her Seishi as they embark on their adventures. This tale unfolds around 60-70 years prior to the original Fushigi Yuugi series, showcasing Suzuno's journey in a new era.