The royal tutor is responsible for educating a prince, a prestigious position reserved for the most exceptional instructor in the land of Grannzreich. Heine Wittgenstein, an adult with a youthful appearance, is summoned by the king to instruct four of the five princes, after their former mentors abandoned them. Determined to transform these young men into suitable heirs to the throne, Heine agrees to take on the demanding role. As Heine introduces himself to the princes, their facade of nobility rapidly crumbles, and each one reveals their genuine character: arrogant Leonhard wants nothing to do with tutors; haughty Bruno deems Heine unsuitable for the post; flashy Licht merely follows his elder brothers' lead, and impassive Kai remains unconcerned. Nevertheless, Heine remains undeterred in his resolve to educate his challenging new pupils, regardless of their attitudes toward him.