sentences:  When he removes the stone from the dagger, the sword essence will possess Ya Se, allowing him to instantly gain evil powers at the expense of losing control over his own actions.Xiao Yu is an exchange student from "Tuo Nan High School" (拓南高中), known as the 4th ranked fighter on the KO Rank, his fighting count being 8500.He is prone to giving others cold looks if they are not willing to leave him alone.