Before the story starts:

Y/n L/n, or better known as Princess L/n, was Princess Peach's sister, living and ruling alongside her in the Mushroom Kingdom. But one day an evil force threatens the Kingdom in the form of Bowser, King of the Koopas. In an attempt to save her sister, Y/n is kidnapped by the infamous King, but whilst under his careful watch you find out more about him than meets the eye...