Rest in Peace Together

Rest in Peace Together is a story about a world that has been destroyed by human nature. It was through war in which the civilization that was once known had been destroyed, nuclear warfare to be exact. But now that the population has dropped quite severely, something interesting has started popping up all around, people with powers. As it turns out, the belief of magic had been true it's just that with the population so spread out mana had grown too thin to be usable in large quantities. But now that the population had been majorly killed, how will those who left react to this sudden shift into something straight out of a fantasy?