A forbidden magic book that has been guarded for hundreds of years has been stolen and the thief is hiding as an intruder at a Magic Academy school in Japan

Elias has a magus who is entrusted to take care of this problem by becoming a teacher at the magic academy school and with his colleague {You} who disguises himself as a student in Elias' class

"What information have you gotten these past few days?"

Asked Elias in a firm and calm voice