Hajimari no Mahoutsukai

He spent his life exploring the mystery of magic, and ended his life with nothing to show for it. After his death, his wish came true and he was reborn into another world. But the world was at a primitive stage where everything was yet undeveloped. What's more, the man is now in the form of a dragon child...? In a mysterious new world, the dragon wizard "Sensei," together with an elf girl, will begin to weave a new history… (Source: Comic Valkyrie, translated)