Babel II - Season 1 Episode 4 Three Servants
Overview: A lobotomy surgery that brainwashes humans with surgery that came to light by analyzing the corpse of Yomi's subordinate, Joby. Yomi is concerned that Dr. Kuraishi and his assistant Arai, who were involved in the analysis, knew too much about the secret, and plans to make them loyal subordinates by adding surgery to them.