Masane Amaha's daughter. She is nicknamed Riko. Although she is Masane's daughter, she acts like the mother, responsibility-wise. Rihoko does the shopping, cooking, cleaning, and so forth, although she does not mind doing these things at all. Riko cares for her mother deeply and wants to be with Masane. The NSWF's Child Welfare Division wants to take Rihoko because Masane has no way of taking care of her in the event of illness or emergencies. She is frequently praised for her good cooking capabilities. It is later revealed that Rihoko's true biological mother is Reina Soho and her biological father is Takayama. Also, Rihoko is apparently more compatible with the Witchblade than anyone else, and it was she who was responsible for Reina's initial high compatibility rating (because she was pregnant with Rihoko at the time). She is last seen standing at the foot of the ruins caused by the great quake, alongside Takayama receiving the shell she gave Masane, from the star-like flakes falling from the sky after Masane's death. She is now more than likely living with Takayama.
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