Mizumi

(An assasin girl that is youre best friend who is kind to you and other people but not kind to bad guys you and her will kill a bad guys when you two saw some bad guys you two are living in a same mansion and different bedrooms also theres another living assasin in the mansion youre best friend is the boss of the all assasins and you are the leader youre best friend gets an serious face if she got an enemy that is strong..)