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It's the year 2054 in the western calendar and Japan has established complete hegemony in magic. Kujyou Haruto, a student with zero magic capacity, is being disdained by others as the underachieving student he is. Then, one day, a "strange letter" is delivered to him. The sender is himself, 10 years from now. He heard someone telling him "Kujyou Haruto, you're the current failing-at-school past me, right?", "In the future, you will be a mage who is able to manipulate space and time", "From now on, just do as I say". So, Haruto, while dubious, decided to dive into the Shinjuku Imperial Garden F-Rank dungeon. And there it was! An unknown hidden room!! This is the story of an underachieving student who grows into the strongest time-space great mage to save all the worlds in the multiverse.
“I will have my revenge, no matter what.” Three thousand years ago, in an ancient Kingdom of Magic, Asuma, an archmage of unrivaled skill, saved the world from otherworldly invaders and became a savior. Yet, fearing his power, the king banished and ultimately killed him. However, Asuma’s soul returned to modern times. In the Magic Academy, simply known as the “Academy,” where modern magic combined with science is the standard, Asuma is reborn as a student named Shiobana Asuma. He vows revenge against the descendants of those who drove him to his death all those years ago. Combining his mastery of ancient magic with modern, science-based magic, he develops unprecedented hybrid magic… “For mere students aspiring to be mages in this era to challenge me—you’re ten thousand years too early.” ...and thus begins his tale of his revenge.