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|Alias||Red King (赤の王, Aka no Ō)|
|Previous Affiliation||Red Clan|
|Novel Debut||K SIDE:BLUE (mentioned)|
Genji Kagutsu (迦具都玄示, Kagutsu Genji) was the previous Red King and the late predecessor to Mikoto Suoh. He is the cause of the Kagutsu Crater Incident, which changed the topography of Japan at the time of its occurrence. This killed Genji Kagutsu along with 700,000 civilians and the majority of Scepter 4 Clansmen and all of CATHEDRAL Clansmen.
- His name, Kagutsu (迦具都, Kagutsu), is derived from Kagutsuchi (迦具土, Kagutsuchi), the deity of fire, pertaining to the fiery imagery associated with HOMRA. Kagutsuchi's mother, Izanami, died of severe burns after giving birth to him; furious, Kagutsuchi's father, Izanagi, slayed him using his totsuka sword Ame-no-Ohabari (天の尾羽張, Ame-no-Ohabari).