The demon king is shrinking me

​Princess Sarah is the next heir of the throne after her father passed away, but sadly for her, at the day of the coronation ceremony, she was kidnapped by no other than the demon king himself, keeping her prisioner at the lands of the demons, but being captive won't break her spirit swearing that her stepsister, the heroine, will come to rescue, facinated by these words, the demon king decided to put a curse on Sarah as she will shrink each day until the heroine arrives or he lifts the curse himself, but during this time she noticed that the demon king wasn't what she expected, the heroine would come at time to rescue Sarah before she gets too small?

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