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In order to receive love from her father, Keira tried her hardest to live the life of a perfect, sub...
(Spoilers)
Cosette is her half sister BUT, the real Cosette was already dead since she was a stillborn, her mother made a contract with a devil and it took Cosette's body since she was still inside her mother. So calling Cosette a demon is correct lmao. The devil just wants to put an end to the world, hence, killing off the 'real' saint and her family was its plan and it succeeded in the 1st timeline