Monster Duke’s Daughter

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Summary:

She was cut off from the world until she was 5 years old and she was taken in by her father the “Monster Duke.”
One day, I sneaked into father’s study without anybody knowing and discovered a strange book… What’s up with the content? I will die because of a sickness? Then, are you treating your foster daughter well? In the end, I’ll die because I’m sick but it won’t happen before that! Then… I will do whatever I want!