Synopsis: The Underworld Transcendent Is Unrivaled at the School——!

Leon Klein was a hero who liberated the world by vanquishing the Demon King. However, following the betrayal of the kingdom, he found himself imprisoned in an abyss. In a hellish realm with no escape, he remained confined until a million magical beasts were slain. After a decade, Leon mastered the [Dark Attribute Magic] and broke free from the abyss. Yet, he discovered that he had ended up in an entirely different world. This world contained an academy dedicated to the study of magic. Furthermore, he was compelled to assume the identity of an unnoticed boy named Kuroba Ren. This esteemed academy trains Seekers, individuals who defeat magical beasts and venture into the unknown. The one who holds sway over this academy is none other than Leon's adversary, the one who once brought him shame, Shark Crandall! "You, the one who took away everything from me is here, huh?" Though Leon has taken over the form of a downtrodden boy, the school's social structure and those who regard him as insignificant held no fear for him.