Maika and Kaho both are highschoolers, but they work in the morning. I assume so since when Maika comes to work, she says "good morning" in most of the episodes. It most likely morning than afternoon.
It's confusing as in the first episode itself, Maika doesn't go to school after work and instead went to an arcade.
Watching the last episode, I'm more or less convinced they work in the morning as Maika and the manager bump into each other at the train station and the time shown on the board was 10:23 AM. So perhaps she goes straight to work after homeroom.
However, in one of the episodes, she did say being held up at homeroom and being late for work. So either Maika was skipping school after doping in for attendance or they have a strange curriculum where they let students do jobs during school hours.
So, when do they go to the school? Don't they have daytime school, or is it evening classes?