Mahou shoujo ("magical girls") or majokko ("witch-girls") are empowered by fantastic powers that both assist and complicate their lives, but manage to save the world against all odds.

In a world where an epidemic, invasion, or unknown enemy has turned it into ruin, few humans have survived. The people with scientific prowess and knowledge are the world's only hope for this apocalyptic danger. Science fiction meets apocalyptic elements are present in this list of series.