Q&A Time:

@Art: The characters will start off after the event that will drag them into the fantasy world, yes.

@Aix: Yes, there will be lots of Maou. It's the ones that survive the initial purges that will be able to grow and cement their powerbase. Basically think of it like salmon eggs and how many actually get to grow up to become salmon in the first place. Hence simply being a Maou means you're a big old target by most everyone affiliated with Light. >.> <.<