Princes Kai, Bruno, Leonhard, and Licht have been making great strides thanks to an excellent education from Heine, the royal tutor. Even so, with the return of Prince Eins, the eldest of the brothers and heir apparent to the crown, the wall they must climb in the struggle to become the most qualified candidate for the throne looks more colossal than ever. Can the four younger princes stand up to their biggest rival?

Princes Kai, Bruno, Leonhard, and Licht have been making great strides thanks to an excellent education from Heine, the royal tutor. Even so, with the return of Prince Eins, the eldest of the brothers and heir apparent to the crown, the wall they must climb in the struggle to become the most qualified candidate for the throne looks more colossal than ever. Can the four younger princes stand up to their biggest rival?

Rumors of Heine’s bloody connection to their father initially causes the princes’ trust in their tutor to waver. When the truth of how Heine came to be the royal tutor is fully brought to light, will the darkness of years past yield to a brighter future—together?

The royal palace is bustling with successive arrivals, which is good news for lonely Leonhard! First, Beatrix comes seeking advice on how to cheer up her cuteness-starved fiancé. Then, young Prince Claude of Fonsein pays a diplomatic visit that pushes Leonhard's foreign-language skills to their limits. When Leonhard's dearest brother Bruno is next to arrive, everyone expects Leonhard to be elated...but the effusive prince is uncharacteristically reserved. Has their time apart soured the bonds of brotherly affection?!

Sometimes kind, sometimes strict, Heine is prepared to employ any means necessary to draw forth his princeling students' potential. But seriously, what's a royal tutor got to do to enjoy a simple, quiet day off?? With royal engagements, reluctant readers, and secret lives seemingly everywhere he turns, Heine may need to up his game if this kingdom is to have any hope for the future at all!

Three of the princes have left home to study away from the castle and the guidance of Heine, but Leonhard remains, still under the strict observation of the Royal Tutor! Beneath the surface of everyday life lies the fierce will to fight for the right to the throne! With change all about them, now comes the time to grow and learn...

Accepting the post of royal tutor at the court of the king of Granzreich, Heine Wittgenstein is a little professor with a big job ahead of him! Each of the kingdom's four princes has a rather distinct personality. Does their diminutive new instructor have what it takes to lay down some learning? It's a comedy of educational proportions!