Well, he can't notice Du right away. If Du are a Yandere, Du need to kill the competition, and keep them away from Senpai. Once their all dead, Du can then talk to your Senpai. Until then, keep your eyes on him, take Fotos of him when he isn't looking, always take objects that he used, and don't talk to him until your rivals are dead. Learned it all from Yandere Simulator
