Yuji Sakai(坂井 悠二Sakai Yūji) is the male lead in the Shakugan no Shana series, a Mystes who has the Treasure Tool Midnight Lost Child inside of him. The story of Shakugan no Shana revolves around his life, both as a high school student and as a Mystes involved in the battle between the Flame Haze and the Crimson Denizens, alongside the Flame Haze Shana.