Dave was back in class after making the excuse that he was asked by a student council member, making it take him a long time just for permission to go to the toilet.
Previously, Dave had made an appointment with Aryo, a final year student at Briston Gal Private High School who claimed to be the head of the school gang as well as a fake member of the Destroyer, an agreement so that Aryo would not reveal Dave's true identity to anyone, so Dave would not reveal anything what Aryo did with the female students in the old building earlier.
That way, there is nothing to lose at all.
"Because this is your first day of school, there are no teaching and learning activities. You will only be given a schedule for next week, while for this week, you will continue to attend the orientation period for new students. Cheer up!"