Heine Wittgenstein, a man of both charm and firmness, is tasked by the king of Grannzreich to become the new tutor for four princes vying for the throne. These princes, with their unique and challenging personalities—Licht, the youngest and playful; Leonhard, the immature elder; Bruno, the studious middle child; and Kai, the reserved eldest—test Heine's abilities. Amidst the humor of their interactions, Heine strives to groom the princes for their royal roles. Yet, his enigmatic past and present shadows threaten the kingdom's peace, adding a layer of mystery and tension to the tale.