At first, it was very touchabke to the point a former strongest agents as a teacher died with pride until his last breath while taking a last advice towards to his former 5 students. I was impressed in the outmost comeback of his return as a baby in the fantasy world where the 'magc' is the most prominently popular among the citizens. However, I felt disgraced and angry to those aristocrats and nobles discrimating the "Colorless" magician and the "Beastkin Slavery". No one can blame them because they are the most influencial and most powerful individuals in the world. I was impressed to the MC when hedeclared to become a "Teacher" instead what I read and watch in other animes like Naruto who wants to become the new Hokage, Luffy as the new King of the Pirates and other main characters. The MC named Sirius, was a notable and literated man with splendid and abnormal brain that released a lot of new ideas, ideology and teachings that was rare and hasn't discovered by someone.
Moreover, he is eager to have his first disciplines despite being 6 years old on that time.
The relationship between his disciples and attendants has developed well. Good Job Author! That is what I want to say at most.