Originally Posted by
KrayZ33
I was thinking more about the fact that she gets beaten by her mom on weekends and after she did that, she escapes to that small shed in the backyard and guess who was waiting for her there? It was really weird that footprints (which led away from the house they live in) where there after all.
Imagine this: Mother beats Kayo -> Kayo drags her beaten body to the shed to escape from the havoc she has to endure every weekend -> Killer/Kidnapper is waiting for her there, because he knows she is doing that after watching that family for a while (remember, he did the same thing in the present with Satoru) -> Killer kills Kayo (or.... well, I don't want to imagine it, poor Kayo) -> Mother who knows she is in the shed (like always) finds Kayo's dead body and thinks she overdid it this time -> mother tries to hide it because she thinks she is the killer.
This way, the killer is never in any real danger in terms of leaving traces and so on.
And if we look at the people who know about Kayo's situation....well, the teacher comes to mind.