An average male prisoner with a standard build. He is a sensible person who is constantly bewildered by the strong personalities of the other residents in Milgram. As a rational individual, he tries his best to adapt to his current situation. Unlike other prisoners who are aware of their crimes, he had no idea what sin he committed to be imprisoned. However, after the second trial, he realized he has a split personality and learned he was incarcerated for the crimes committed by that persona. Even late at night, noises can be heard coming from Mikoto's cell, making his sleeping habits a topic of discussion among the prisoners. During the first trial, he had no awareness of his crimes and treated his imprisonment in Milgram like an internet broadcast or a variety show. Mikoto cannot remember what happens while his other personality is active, which is why his primary persona knows nothing about the murders. If excessive stress is placed on the primary persona—such as being interrogated about the murders—the other personality, John, emerges. He maintains amicable relationships with other prisoners and unconsciously smiles and acts friendly during every conversation. While basically kind and affable, he is a multiple-personality sufferer with a violent persona named John. This personality emerged due to Mikoto's excessive stress; John possesses a will to protect Mikoto and seeks to have Mikoto forgiven. John is fundamentally violent and coarse, but surprisingly showed a rational and sensible side during the second trial, calmly persuading and making a deal with Es to forgive him while acknowledging his actions. Since John isn't technically a prisoner, he isn't strictly bound by the rules, yet he doesn't attack other prisoners and hasn't caused major trouble within Milgram, proving he isn't a mindless killing machine. Mikoto returns to his original personality with no memory of these events, living listlessly without realizing he is a murderer. After receiving a 'Not Forgiven' verdict in the first trial, his restraints increased and his beliefs were denied, leaving him in a poor mental state, though he still tries to maintain a smile. After the second trial, he seems deeply confused about his own existence. Having realized he killed people, his mind is broken to the point of vomiting from the shock. John, the personality created to handle Mikoto's stress, seems to have disappeared as promised to the warden: 'If you forgive Mikoto, I will disappear.' He also seems to have only just realized he has another personality. His occupation is an office worker, specifically a designer at a top-tier advertising agency. Though he claims to have worked incredibly hard to get in, his treatment at the company seems poor. In flashbacks, he is seen falling asleep at his computer while drinking Red Bull, and the MV shows him leaving work at midnight after being harassed by his boss. Although he graduated from an art university, he was in a department unrelated to drawing, so he isn't very good at it; he says he only studied the bare minimum because he prioritizes efficiency. According to the official app timeline, his favorite foods are pasta, tapioca, and basashi (horse meat sashimi), and he has recently taken a liking to pudding. Despite his gentle appearance, he is often called a 'playboy' or 'delinquent' by other prisoners due to his flashy hair color, earrings, and attitude. He tries not to get annoyed or angry at others in any situation, striving to keep a smile on his face. He tries not to show it when he's struggling. He has killed a total of twelve confirmed victims. Even worse, the victims John killed were all unrelated people who meant Mikoto no harm: a homeless man betrayed by a friend (Taishi Nakabayashi), a 31-year-old salesman and father of two (Shinji Kawashima), and a single mother (Sana Yoshikawa). Mikoto knows nothing of their circumstances or who they are. John testified that he killed whoever he saw, like random spree killings. The final victim, Kei Nago, was someone who misunderstood Mikoto's state as being injured and tried to help him. Mikoto began to remember these scenes after John disappeared and is now suffering from the guilt of what his body has done. His bangs have grown long since he hasn't cut them after the second trial. Even if he leaves Milgram, he faces a high probability of the death penalty for twelve murders. Perhaps because his other personality vanished so suddenly, he often contradicts himself, confused about whether he was the one who said something. Currently, his mental health is poor; he vomits frequently, and his mouth often twitches when he tries to force a smile. He does not mention his work at the company. If he comes to rely on someone, he tends to become obsessive.