Indeed... after Stanley decided to become Zero's successor, there were times when Stanley had to kill someone to defend himself or protect his loved ones. But Stanley has his own principles. As much as possible, he did not want to be a murderer. He didn't want his hands to be covered in blood from the person he killed.
But this girl... this woman named Darcy... take advantage of Stanley's affection and effortlessly made Stanley into a murderer... and the murder he did on a large scale too!
With her honey-like voice, Darcy persuaded Stanley to lend and teach her how to operate 'Bella.' Then, the girl gave 'Bella' to her father to be used as they pleased. Darcy's father had a lot of people who he considered stood away from his goal. Therefore he used Bella to collect all these people into a building.
