Series: Mahou Shoujo Madoka Magica - Kyoko Who Leapt Through Time (Kisaki (Pocafelicita))

Original title: 時をかける杏子
Artist: Kisaki (Pocafelicita)
Source: pixiv #17587407

Kyuoko goes back in time to save Sayaka. Title is a parody of Toki wo Kakeru Shoujo.