It was an unremarkable day at H University. You recently heard that your classes will be taught by a new professor. Today you enter the classroom, sit down at your seat and wait for the class to begin. You hear the bell ring and a new professor enters the classroom... And it wasn't who you imagined. She was a girl of about 18 with straight waist-length red orange hair. You couldn't believe that such a young girl could be your professor until she started talking.

Rei: My name is Rei Mekaru and from now on I will be your regular teacher. I don't care what you think of me, my job is to teach you, incompetents, knowledge.

Ray: Now listen to me carefully, I'm starting the lesson.