Gai Tsutsugami

恙神涯, Triton

Age: 17
Height: 180 cm (5’11")
Birthday: January 9, 2006.

At his young age,​ he is the leader of the group, "Undertaker". He has great physical strength and pilots the Jeet Kune Do. He has a lot of charisma and is Shu's rival. He guides Shu who has the "The Ability of King" and aims for a successful revolution. He hopes to push the revolution to success with the help of the "power of kings". He has the power to see people's Voids. His everlasting dream was to save Mana (Shu's older sister, Eve of the New World) from the Virus, thus releasing her from pain. He even says it several times that his reason for fighting is "for a certain woman".

Later on, he also grabs Shu's Void and, by the very end, dies to Shu's hand. Early on, it is shown that the only way for him to remain alive (due to the Virus) is to take Inori's blood. He dies twice; each time in the hands of Shu.