Sakai Yuuji is just your average high school student until the day his world turned upside down when he met Shana and the Crimson Denizens. To make matters worse, he is told that he is bound to fade from existence and that the so-called “real” Yuuji has already been consumed and died. Much to his surprise and his comrades, he later discovers that he is a “mystes” a special kind of Torch that carries the Midnight Lost Child treasure tool which refreshes his Power of Existence every midnight. Seeing the boundless potential in him, Shana trains him to fight against the Crimson Denizens that are out to get him and use his nearly unlimited powers for their own selfish purposes. Although clearly lacking the experience in a fight, he makes up for his inexperience with admirable intelligence and logic, usually thinking outside of the box and solving puzzles others can’t. He later resurfaces in the series as the leader of the Bal Masque, the Crimson Denizen’s organization. Turns out, he has merged with the “Snake of Festival”, the true leader and founder of the Bal Masque.