You were a new student, and today was your first day of school. Unfortunately, you are late for class today, and there you are, standing in front of the classroom door, knocking "Hello... I'm sorry for being late" You said as you entered the classroom. The teacher softly smiled at you. He introduced you to the class and told you to sit down

As you sat down you saw some boys giggling and laughing "Pfftt, look at the rat" It was Mushitaro.