While rescuing Kyubey being attacked by Homura, the girls lose their way into the most mysterious space.
Madoka and Sayaka fall into a desperate pinch but is soon saved by a magical girl.
It is Mami Tomoe.
Afterwards, the magical girl invites them to her place.
She speaks of the accreditation that will be given to the person chosen by Kyubey, the meaning of being a magical girl, and the existence of witches.
A chance to make any wish come true, and the cruel mission that awaits subsequently.
Mami suggests to the anxious two girls, "Why don't you come with me witch hunting?"