Because that's the logic of video games ) Something must happen so that the lore continues with a sortha logic. Anyway, if you see in 20-2 it's a state of emergency, that applies to all Flower Knights, so you aren't any exception (you meaning, your squad of girls and you Knight Commander). But of course, logic is logic so you can be an exception, if you clear some stages and some Pests.
You're welcome)