Kaidou is Kasane and Nogiku's father, and Nagi's older brother. While working as a stage director he saw Izana (as Sukeyo) in a play and became obsessed with her, eventually convincing her to come work for him, which brought them great success.
Regarding Sukeyo:
After they get married and Izana gives birth to Kasane, Kaidou discovers her secret and rejects both her and the baby, turning to the real Sukeyo in an attempt to remake her as "his" Sukeyo. Enraged at this failure, he gets Izana to imprison and use Sukeyo to continue the act.
Regarding Nogiku:
Eventually, Sukeyo reveals that she is pregnant with Kaidou's child, Nogiku. After Sukeyo and Izana die, Kaidou becomes obsessed with transforming Nogiku - who looks very much like her mother - into "Sukeyo Fuchi", going so far as to force her to dress, speak and act like "Sukeyo", and eventually emotionally and sexually abusing Nogiku for years.
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