Ouka Furude

She is apperently an ancestor of Rika and Hanyuu.
In one of the puzzle pieces and in Miotsukushi-hen, we are shown a scene from Hanyuu's past, in which Hanyuu, or whatever her name was back then, is confronted by Ouka in a burning building holding the Onigari no Ryūō, a sacred demon banishing sword.
We can assume that this "Hanyuu" was killed.
After reading the puzzle piece about this incident, we can say for sure that Ouka was
*spoiler* "Hanyuu's" daughter. *end spoiler*
(More info would help)

She is apperently an ancestor of Rika and Hanyuu.
In one of the puzzle pieces and in Miotsukushi-hen, we are shown a scene from Hanyuu's past, in which Hanyuu, or whatever her name was back then, is confronted by Ouka in a burning building holding the Onigari no Ryūō, a sacred demon banishing sword.
We can assume that this "Hanyuu" was killed.
After reading the puzzle piece about this incident, we can say for sure that Ouka was
*spoiler* "Hanyuu's" daughter. *end spoiler*
(More info would help)
