If Maika and Kaho work in the morning, when do they go to the school?
I've watched a bunch of episodes from the anime and it was never explained why.



In fact, here are some possibilities that I could think of:


They may have left school for work after dropping in for attendance, like how you have guessed.
It may not have been morning. Sometimes in Japan, it is quite common to say "Good morning" when you get to work, regardless of what the actual time of the day is.