Yui appears to show Yui appears to show a sadistic side in Nightmare Mode and in spin-off. In nightmare mode she is, depending from situation, fooling and lying to you, to get closer to you and kill you with scissors (for example, when Ichikawa lied to you that Saiko is haunts on Yui). In Halloween edition she trys to kill you everytime she sees you. Yui verbally abuses you in every possible way, calling you a "piece of shit", wishing that you’d "died already". She also make fun of Saiko.