Chapter 1 of 'Have a Nice Day' manga might introduce the world and characters. Maybe it starts with a captivating event or a mystery that hooks the readers. It could also lay out some background or themes that will be explored throughout the story.
There are several options. Sometimes, official manga platforms like ComiXology or Shonen Jump might have it. Also, some fan-run sites could host it, but be careful of the legality and quality on such sites.
The first chapter usually sets the stage and introduces the main characters and the initial plot. You might expect some interesting character introductions and the start of an engaging story.
One idea could be that Bakugou wakes up with a strange quirk malfunction that makes him overly nice. He starts complimenting his classmates, which leaves everyone in shock. For example, he tells Deku that his analysis skills are actually really impressive. This throws the whole class dynamic off, but in a really interesting way.