The Rival's Heir

Sage got her Sofia the first moment as she was taken out of school one day only to be given the title of princess, leaving behind her foster family and her old life back in the past. Luckily she meets her body guard who becomes more of a bestfriend to her than a protector, instantly lifting her spirits on such high responsibility. But was she right to trust him, does he have some secrets up his sleeve, or rather, is there come who is using him as the trick up their sleeve to lower the guard of Sage and her kingdom?
Her birth parents brought her back, taking her away from her old life, to become the next heir of Xera, one of the four kingdoms surrounding a forest, known well to be enchanted. Her whole life takes multiple twists and turns even towards facing a possible war??