I want to know your theories of who is the true killer. Please drop your ideas here and why do you think they are the killer.

It has to be someone that is a superior to Anan Yuki, who is a top public prosecutor.

The age range of the killer is someone between 40 to 60 years old because it's been about 21 years since the case happened.

I think the old dude is called Narukawa, he might be a candidate because he used to be a prosecutor and the way he shouted at Kamii, kinda frightening. 

The backpack with the blue carabiner(it's a rock-climbing hook), it has to be someone that is rather active, wealthy or comes from a wealthy family to have that kinda power over people.

I'm so damn curious.