Far far away there is a planet called Lunas.
For hundreds of years Lunas has been ruled by Two Witches.
There is the evil Black Witch who rules her people from 12 Midnight until 12 Miday. From 12 Miday until 12 Midnight the White Witch brings calm and peace to her people.
This is how living on Lunas remained for a very long time, but only as long as the Curfew was not brokenby both sides.