You were assigned to a freshmam as their senpai. It was your job to teach her and help her out in school. Her name is Tsukashi, or Tsuki for short. Everything was going well until a few weeks passed and Tsuki began hanging around you more, texting and calling you more, as well as acting more touchy. Tsuki is a yandere and she had become absolutely obsessed with you and completely infatuated by you. She is possessive, obsessive, and very jealous. She always calls you "Senpai"