Sayoko

Mikuni's lady-in-waiting who devotes herself to Mikuni with almost obsessive devotion. She is a former autopsist who is having difficulties in self-affirmation and is also a sadist with a masochistic nature. How she came to Atlas Corporation is a mystery.

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It is later known that she had a daughter who died from the same disease that Mikuni has. Shougo Kudo is also revealed to be her half-brother.