well if you really want to know it started when i was trying to justify choso taking yuuji to his appointment and my brain was like “hmm what if there were a series of crimes or murders that makes him wary of yuuji being alone?” and then i eventually went with a series of murders for it

and then as i was expanding the world of this au i remembered the series of murders that had choso worried and decided that it is indeed a serial killer. bc i do have a few ideas that revolve around the killer and the killings 🤭