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mage_goo
That's all well and good if you're not the target of their revenge. Which this would totally be in that latter category.
Though, I am still of the mindset that she is going to get napped and demonized, forcing Shin to learn the unlearnable reversal magics. If I wanted to pad a story, that's what I'd do. Nothing beats padding like getting to the final boss only to find out your lover is the semi-final boss, forcing a retreat and subsequent depression scenario. Followed by uplifting moral "if anyone can do it you can", then a journey to the West to find out about the mythical magic. Blah blah, you get the point. We're talking padding levels you wouldn't believe!