Mikoto Kayano. A 23-year-old man with a gentle impression, 176cm tall. He was an office worker suffering at a top-tier advertising agency (a black company), but unable to withstand the extreme stress, he developed dissociative identity disorder. He killed 12 people in two days and was brought to a place called Milgram. At first, he didn't know about the other personality or the fact that he was a murderer, but entering the 3rd Trial, the other personality disappeared so that Mikoto could be forgiven, and as the memories of the murders were transferred to him, he became mentally unstable.