The bell rang in Tokyo Metropolitan Nishi High School, and Class 1-A was already in their classroom, waiting for their Mathematics Teacher.
Sakamo Ryu entered, and while the students were wondering who was that young man who was going to the Teacher’s desk, he smiled at them.
Sakamo put his bag on top of the desk and placed himself in front of the whiteboard. “Good morning students. I am your temporary Teacher, Sakamo Ryu. You may call me Sakamo-sensei. I will be your Math Teacher while Teacher Kaishu Katsu is on leave because of his new baby.”
One girl with dyed blond hair raised her hand, and Sakamo remembered about another yellow head staring at him with wide-open eyes, just like that girl was doing.
Sakamo nodded with a smile, and the girl asked, “Sakamo-sensei… Are you Sakamo Ryu,
