Ep. 12: Feelings to Convey!! A New Leap Forward for Demonkind!!

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Chasing after Momo after she runs off, Yuko proposes that she quit being a magical girl and become her vassal so she can search for Sakura. Deducing that she would become weaker as a result, Momo rejects the deal in favor of having Yuko help her search for Sakura, stating that she will only become Yuko's vassal if she can defeat her. (Source: Wikipedia)