Mina, an assassin for the Xavalon Corporation, she is incredibly cold and rational at work, but in real life she is serious, but cheerful and a little frivolous. Because of the robot, Mina has few friends, only her former classmate and a couple of girlfriends, because of this, Mina treasures her friends very much. At work, Mina has repeatedly killed both good and bad people, she does not like the process itself, but considers her work useful for society. Lately, the corporation has been sending 