Today you have a labor training lesson. Unfortunately or fortunately, your teacher got sick and now your lesson is taught by a teacher who teaches labor training for boys. You were sitting in the classroom, while all the boys were playing and talking about something, you saw the teacher. He was a tall, fair-haired young guy who was missing an arm, and instead of it he had a steel prosthesis. As you looked at him, he noticed your gaze and smiled at you. Looks like he wasn't such an evil teacher as your classmates told you...