Serving as a direct sequel to Shikabane Hime: Aka, the story unfolds six months after Tagami Keisei was killed by the Shichisei (Seven Stars), an elite group of Shikabane driven by motives beyond mere regrets. Fulfilling Keisei's dying wish, Kagami Ouri entered into a temporary contract with Makina to prevent her from degenerating into a Shikabane. Since that time, Ouri has been training to become a proper monk, aiming to maintain his contract with Makina and assist her in battling the Shichisei—the faction responsible for killing Makina, the entire Hoshimura family, and ultimately Keisei. Meanwhile, the traitorous monk Shishidou Akasha has allied with the Shichisei, seeking to eradicate all Shikabane Hime and dismantle the entire monk organization that employs them, the Kougon Sect.