Monogatari no Naka no Hito

A young man named Rihido, who has lived in seclusion for centuries and remains eternally youthful, chooses to reenter society. While in the woods, he encounters a noblewoman named Mycenae being pursued and assists her. Through this meeting, he learns about a magical academy and becomes determined to enroll. To do so, he alters his appearance to look like a teenager and takes whatever steps are necessary to gain admission.