Final Fantasy X: Puella MagiFinal Fantasy X: Puella MagiFinal Fantasy X: Puella Magi by MikariStar
This article has a lot of spoilers for pretty much all the biggest plot points of Puella Magi Madoka Magica. I should also mention that surprising plot twists are a big part of what makes Puella Magi so enjoyable and a series that you'll want to watch at least twice, first to be surprised at the revelations and again to see everything in a new light, knowing what's really going on.
Puella Magi takes place on earth, which, like Spira, is trapped in a cycle of death. The universe is basically running out of energy faster than it can produce it. To prevent other planets from becoming barren, a race of aliens known as Incubators are trying to release energy into the universe. That energy comes from human emotion, with the most plentiful source being adolescent girls. Kyuubey, an Incubator, goes around offering the girls wishes in exchange for granting them magical powers along with the duty to use them to fight witches. What he doesn't mention is that magical g