|0203 The Devil's Proof|
Koki Mima is the old man who is assisted by Kamui. He kills people in a medical center with the intent of setting them free.
Mima is an older man with short gray hair who wears eyeglasses with a brown frame. He is seen wearing a brown jacket over a blue collared shirt with light colored pants and brown shoes.
- Mima's given name was never shown in a profile or among the credits in endings. However, his full name was labeled next to his photo pinned on a MWPSB white board.
- Mima uses several times a respiratory mask (put away in his robot dog, which carry also club), which shows that he is undergoing a course of treatment.
- His smart phone can control the medical facility.