outofMRIs. I haven't finished this anime myself, I'm almost done, but I'll try my best! XD
So Maki is the CEO of the project MRI. MRI takes a victim's brain and shows their entire memory, which is how the FBI finds out who the killer was. Maki is hated by people for inventing MRI as it shows ALL of the victim's memories. That causes issues from families. He's seen the worst of murders, and isn't disgusted by anything.