|Японское имя:||天宝院 遊騎|
His ability is 'sound' which allows him to listen and identify sounds from distance, travels in the speed of sound and manipulate soundwave to attack. When he temporarily loses his power, he becomes a red-haired cat. Like Heike, he too seems to not prefer the idea of killing, as he went out of his way to save a pregnant woman and a small child from an explosion. His addition to the Code of Hammurabi has yet been revealed.
spoilerIt's later revealed that the reason Yuuki works for Eden is for the sake of his childhood friend, Makoto. As a child, Yuuki was ostracized due to his special power, and Makoto and Shigure (another special power user, a future Re:Code) were the only ones to approach him. Once, Yuuki selflessly tried to save others from the rubbles of a collapsed house, and Makoto got severely hurt protecting Yuuki. Since then, he has been in a coma, which caused Shigure to hate Yuuki and vow to kill him to avenge Makoto.
In the latest chapters, Makoto is shown to partly regain his consciousness, and is able to send a message in Morse code to Yuuki, telling him to bring his friends the next time he drops by.