A female demon is sent to the mundane world as punishment for her crime: murdering hundreds of children and infants with her deadly shadow. She must find the rival of the Demon Capital leader and cannot return unless she kills him.
As soon as she reaches the destination where her target resides, she finds it hard to assassinate him‒she has fallen in love with him.
Now with feelings for her leader's rival, she must choose her next actions wisely, for now both his and her lives is at stake.