Unfortunately, there is no way anyone knows of to restart the Fashion Story game. You will need to delete it and start over again to get a fresh start on the game.
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I emailed Teamlava, the producers and asked them if I could restart my account. They replied saying that for right now this game isn't able to restart.
I don't think you can restart one story, but you can reset the whole game without uninstalling. It will tell you on the first page of the manual thingy.
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you have to uninstall the game and then reinstall it
I'd just re-install the game.