Responses
Agreed but is it really unexpected? Satou did hand Kei over to be tortured in order to change him into someone Sato could use. I expected him to turn on Tanaka the moment the guy saved that secretary bc Tanaka showed he didn't hate all humans. He would no longer kill just because Satou told him to. Hence, he is rather useless to Satou.

My only comment on the new chapter is...
What the fuck satou