Ayano's father and Genma's cousin. He is the current head of the Kannagi family. Jūgo worries about his headstrong daughter. Contrary to the Kannagi doctrine that is based solely on strength, Jūgo has been trying to stop discrimination against the Fūga Clan. He also regrets not being able to stop Kazuma's expulsion from the family. Believing that Kazuma is essential to the Kannagis, he constantly creates situations in which Ayano can form a relationship with Kazuma. There appears to exist mutual respect between Jūgo and Kazuma. As the head of the Kannagi family, Jūgo is responsible for directing the other members of the head family and branch families as well as the Fūga Clan. Jūgo is never seen in the series leaving the Kannagi compound, and rarely even leaves his meeting room.
He is actually considered to be the strongest Enjutsushi of the Kannagi and wields the purple flame but because of what happened to his leg during a car accident, Genma is considered to be the strongest.