The mysterious figure is a girl named Naoko, she is a Demi human with mixed properties of a Chartreux cat. She works for a secret assassination organisation called the Demonic Arc of the Nefarious Knights or D.A.R.K for short. She works for the organisation to pay off her mother’s hospital bills as her mother is infected with a rare disease that slowly is sucking out her life force that will ultimately kill her. Naoko is a bit clumsy at her job when assassinating her targets.