Once the courses of the Sky Academy started, they wouldn't stop for anything else. There were thirteen courses in total. Students were going to learn one class a day and study the same course twice a month, without interruption.

The academy would work out the next month's class schedule at the end of the month and the schedule would be distributed to each student on the first day of the month. The order of the courses of different classes was not exactly the same. In a month, ...