Puella Magi Madoka Magica, Vol. 3 — Magica Quartet

Madoka is horrified to learn the true nature of the witches she and her
friends, the Magical Girls, have been fighting-and the terrible fate
that awaits any Magical Girl who accepts Kyubey's offer of power. Having
watched countless Magical Girls sacrificed for the larger aims of his
people, Kyubey is only interested in securing more girls to that end,
and Madoka is left with his chilling reminder that she too is destined
to be a Magical Girl of incredible power... Can Madoka and her friends
escape this tragic fate?