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TL;DR: Rikka probably taught Nibutani the incantation before she headed off to battle Dekomori. The incantation probably does not come from Shichimiya, since Shichimiya uses a different incantation in her battles against Rikka in season 2. Moreover, Nibutani most likely never did battle as Mori Summer before, so it makes sense for Rikka to have taught her ...

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