Manga World Teacher – Other World Style Education & Agent

Once upon a time there was a man who was a secret agent in the modern world. After which he became a teacher for the next generation of agents. However, on one of the missions, he dies. After he wakes up, he turns out to be a baby in a parallel world! He received the name Sirius, and now begins to receive lessons in magic. However, he retains his past life memories, which is why he wants to continue teaching. When he gains immense power, he will be able to realize his dream as he begins to travel and teach magic!