Royal Teacher Heine | | (Dubbing) has a small stature and cute appearance. As a completely ordinary person, he has neither a prominent life background nor any higher education, but he was unexpectedly selected to become a "royal teacher." His task is to select malleable talents from four princes with different personalities and train them to become candidates to inherit the throne. Reinhardt (voiced by Daisuke Hirose), who has a more beautiful appearance than a woman but lives in deep self-esteem, Bruno (voiced by Adachi Yuuto), a stubborn and extreme personality who is full of poetry and books, Richter (voiced by Shota Aoi), who is cheerful, optimistic and approachable, Kai (voiced by Yuya Asato), who looks cold and inaccessible but actually likes cute things, what kind of problems will these bear princes who do not obey discipline bring to Heine?