The Royal Tutor Vol. 13 (manga)

The ongoing troubles at Café Mitter Meyer leave Licht feeling helpless as he witnesses firsthand the hate directed at his master for his Kvel ancestry. Infuriated by the kingdom's ugly dark side, Licht realizes he has an opportunity many do not: the power to enact change from the highest level of government, the throne itself! With his return, all four brothers are reunited in the palace. They have all been transformed by their experiences apart, and each is more determined than ever to rule for the betterment of Granzreich!