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Monk Gen'un starts by telling Jun that he is being targeted by the dark monsters and about the war between humans and Oni's (demons) back in the Heian era.
Their lyrics were in the style of Heian era poetry, their costumes frequently incorporated traditional Japanese clothing styles, and traditional Japanese instruments and drum rhythms were used in some of their songs.
It expressed that sensitivity to beauty which was the hallmark of the Heian era.