Another World: My Brother and I Are in Another World

I, a college student, traveled to a different world for unknown reasons and was bound to the system. I was also called a brave man by those people. My brothers also accompanied me to this different world, and they also had a system. However, we didn't want to come to this world, because we had finished writing our papers, submitted them, and were about to get our diplomas, and ended up in this different world!