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How does the story go initially in your imagination?

Urobuchi: The idea is something like "Homura becomes a witch, and the story happens in the barrier". At that time, however, the ending shows Madoka brings Homura away. So I thought it is the real end of story. But both Iwakami and Shinbo suggest to make store after that, so it seems not OK. When I was vexed, Shinbo said that "Madoka and Homura might be in opposite relation". This brought me a breakthrough. Homura becomes the opposite existence than Madoka.