The "Man with the Scar", or "Supervisor" is a major antagonist in the Nanbaka Web Manga and Anime. He is responsible for Jyugo's irremovable shackles. His real name has been revealed to be Mashiro Mutsuki (睦月 真白, Mutsuki Mashiro) . He is also the person in charge of Shiki.
This character is being pursued by Jyugo as a clue to remove his shackles and is closely connected to Musashi's past and to Elf. The character's details remain shrouded in mystery.
The front of Mashiro's face has yet to be revealed, however, there are a few hints as to what it could be. In Jyugo's memories he is only shown to have a red scar that is horizontal with three evenly spaced vertical lines on it, as well as black hair. Later, in Musashi, Noriko Sanzou's memories and the present time, he is shown with white hair, which could indicate that it has been many years or that his hair is naturally white.
Mashiro's personality is unknown since he has never appeared far enough to describe it and all the information on him is told by others, not by him. However, as seen how he leaves Musashi alone once he has done experimenting with him in the flashback, Determined to create a being akin to god, he's willing to sacrifice others for success including the lives of his own family showing that he has little regard for life and is callous. Jyugo describes him as sadistic while Elf seems to respect and look up to him. He also worries that Team Elf isn't doing their job properly.
Some time in the past, Mashiro encountered Rokudo became an Offender. After his encounter, he researched Offenders.
Mashiro appears tasking Isou to tell Mei and Ido Yomidou to kill Jenny and Jemi Sandra. Afterwards, he seems to forget that Isou is there and repeats Isou's name, Isou telling him he is there.
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