A True Friend is the forty-third chapter of the Oushitsu Kyoushi Heine manga.
Kai announces to everyone that his friend from military academy is visiting the palace. This surprises both his family and the palace staff, who work their hardest to ensure that the visit goes well. Kai also gets his brothers to help him in case things gets awkward. His friend, Elmer von Bismarck, is met with a grand welcome, flustering him. However, because of Elmer's nervousness and Kai's introvert tendencies, the princes are forced to help out. Things don't go as planned as they only freak Elmer out further with their eccentricities, culminating with Leonhard stealing his torte. To their surprise, they make Elmer laugh, and he became much more relaxed. He and Kai become less formal around each other. They spend the rest of the day walking around the palace before they bid each other farewell. Heine tells the rest of the princes that he hopes they also find friends.