The Royal Tutor Series by Higasa Akai

Accepting the post of Royal Tutor at the court of the king of Grannzreich, Heine Wittgenstein is a little professor with a big job ahead! 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!

When the king returns to court, it's time for the princes to prove their mettle. But not everyone's been exactly keeping up with Heine's lessons... (Hint: It's the prince who only scored a one on his assessment test...and that was for signing his name!) Can Heine really whip these boys into shape well enough to rule a country?

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!

Heine's efforts to shape the princelings into worthy successors to the throne continue, but it seems that Bruno in particular is struggling with a bit of a crisis of conscience when it comes to his future. Can he live up to Heine's standards to remain his "apprentice"? More importantly, does he have the courage to carve out his own path?

Prince Licht's fascination with coffee should come as no surprise given his affinity for his part-time job at the cafe, but when Leonhard suggests the bitter drink should be banned from the kingdom, can Lichie help him develop an appreciation...?

Heine and the princes have overcome many a difficulty together, deepening the mutual trust between the teacher and his pupils. But even though Heine has walked closely alongside the princes as they slowly come into their own, the royal tutor himself still remains a mystery to them. When Count Rosenberg claims to know who he really is, could Heine's secretive past become public knowledge?

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...