katherine is one of the daughters of the demon king, paimon. despite being a daughter of such powerful demon, katherine decided to avoid violence and focused herself to read books. she's self-disciplined and don't have a single care about all that is happening around her, all she wants is knowledge which led her to become an archdemon and her father, paimon. wanted her to interact with people more, or maybe manipulate them in her own will. 

he decided to trick her daughter into entering a place filled with books which katherine couldn't resist the temptation to read them, it was only a trap for her to learn how to interact with people. with anger, katherine tries to fight her father but it was too late, she was trapped in a place where she must make connections of her own.

katherine usually reads a lot wherever she goes, hiding within mortals and only appears to become a demon when it is necessary. however, she's not introvert or shy, she has an eccentric and egotistical attitude with a strength of 40 men and a mind like her father. she knows almost all the answers into people's questions, but she doesn't do that for free. a higher price has to pay for her to tell what people wantes to know.