After failing his mathematics course, Eren Yeager decides to take private tuitions with a substitute teacher, named Levi Ackerman. Levi, tauntingly quiet with what he does, begins to silently suffer with the world, and finds himself trapped in the spotlight, and eventually gets classed as a crazed, distraught man. After witnessing a dose from what his teacher is really like, Eren is already locked within Levi's problems, and has no way of getting out unless he does what Levi commands him to do. Trauma seems to be Eren's neighbour, minding its own business but really, taking its toll on the boy's open mind whenever it has the chance. Finding microscopic cameras in your room, hearing a familiar voice each time you reach your front door and having your teacher sexually harass you after school hours. Eren didn't ask for any of it. ~ Mature themes/mental horror/bad language/sex.