Shounen Onmyouji EP15 - Release the Catastrophic Chains

It is revealed that Moronao has mistaken Yukinari for his grandfather, Fujiwara no Koretada, and seeks to carry out revenge against Yukinari’s grandfather (who’s already dead) for tricking him and causing his exilement. Masahiro tricks Moronao into a barrer and was about to perform an exorcism when spirits are brought to life by the mysterious woman who had released Moronao from his grave. Who is this woman and will Masahiro, his grandfather, and the 12 Shinshou be able to stop the spirit rising and this woman, while taking care of Moronao before he finishes off Yukinari?