Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ - Volume 1 Chapter 4

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

Goddamnit! Now I’ve got to look for another job to pay the bills! That f*cker! I did nothing wrong!

A ritual, with the sole purpose of obtaining immortality, goes horribly wrong. What's left in its aftermath is a boy who receives an inheritance from the Void, a mysterious place that embodies darkness. With a newfound power, he is given a chance to carve his own way into the world.

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