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Rihoko is a young child that is very mature for her age. In some ways she is more mature than Masane Amaha who is supposed to be her care giver. Rihoko does a good job taking care of herself and others. She is cheerful and responsible. She was raised by Masane who thought they were parent and child since the latter lost her memory. Reina Soho is her biological mother who comes back later in the series to claim Rihoko and see what motherhood was about. When Reina dies custody of Rihoko reverts back to Masane. It is later revealed that Reiji Takayama is her biological father. She goes with him when Masane appears to die from prolonged use of the Witchblade.