Though Sayaka Miki's wish was fulfilled, the unforeseen consequences that came with it overwhelm her, causing her soul gem to become tainted as she succumbs to despair and eventually loses her humanity. Homura Akemi reveals to Kyouko Sakura and Madoka Kaname the ultimate fate of magical girls: once their soul gem becomes tainted, it transforms into a Grief Seed, and they are reborn as witches—a truth Homura learned only through repeating history countless times in a bid to prevent Madoka's tragedy.