The first Witch Haruto encounters in the dream world. Nicknamed the "Witch of Thunder", Yuko uses Haruto for her games and attempts to kill him when he refuses. With Lily's help, Haruto realizes Yuko is actually a girl who had her heart broken after a cruel joke and went to the dream world to escape from her problems. Haruto helps Yuko move on from her suffering and allows her to return to the real world.