Yui Sagakure

Yui Sagakure was one of the Quasi-Spirits participating in the Doll Master's death game. In actuality, Yui is the younger sister of Yuri Sagakure, in place of the original whom Yuri killed to prevent her from leaving their home. After the incident, Yuri built robotic replicas of her sister, separated into two types: the robot-like mass production model that are to serve in Netzach, and the "Best Model" who are nearly identical to a real person. The Best Model are sent to serve as spies for other Dominions who enjoyed Yui's espionage ability, but also aware and assuming Yui could betray them any time in favor of her creator.