1. It's a manga
2. It's a cultural difference. The relationship between Japanese student and teachers are...quite interesting. They're very casual.
agree with the other anon. it differs from countries and cultures, in my country you can easily leave class/school with a simple excuse like a headache or stomachache.
I used to tell something like "have stomachache" or "headache" to skip class and sleep... A bad girl, aren't I?
Where I live the main problem of our teachers is to keep us all in the classroom, every excuse is good enough to skip classes! Parents don't even know most times
I couldn't even skip p.e with those excuses
yeah, i mean, i still had to attend p.e. a couple of days after getting out of a surgery.
Can we just acknowledge the fact that students in manga can simply get up and walk out of class/school with a simple excuse like "my stomach hurts". On the other hand we have to break two bones, get thrown on the floor five times, and faint three times to have a day off. Not to mention I get sent to school with a fever. Is it just me or does everybody want to go to a school like this X'D