I'm trying to find an anime that I saw years ago but I can't remember the name and looking at anime lists is no help. It's a show about these girls who live together and have magical powers and they're trying to stop a curse that will end the world and at the end of the anime the time for the end of the world is too close and they combine their powers to set the world back in time to the exact same time when the anime started and they forgot everything. So it's like they're stuck in an endless loop where it will occur again and again.

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