Puella Magi Madoka Magica

There exists strange creatures who have the power to grant one wish to a chosen girl. However, in exchange, that girl must then become a Puella Magi, a girl with magical powers, and fight against witches, evil creatures born from darkness that are responsible for murders and suicides. In the city of Mitakihara, a schoolgirl named Madoka Kaname and her friend Sayaka Miki are approached by a familiar named Kyubey, who offers to grant them each one wish in return for making them Puella Magi. But having magical powers is not always what it seems.