Quote:
Originally Posted by GabrieliosP
Hanyuu stays with Rika because Hanyuu is the ancestor of the Furude family. She fell in love with Furude Riku and they had a daughter, Furude Ouka (who if physically identical to Rika, go figures). In fact, it was Ouka who performed the Watanagashi on her own mother 
Dunno why she appears as a child, but have a look at adult!Hanyuu (aka, Hainiryuun Ieasomuuru Jieda) from Kizuna:
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Wow, thanks for that in depth answer!!
And I didn't know Hanyuu's own daughter did Watanagashi on her own mother... oh goodness.