Magic Maker: Isekai Mahou no Tsukurikata

A man who was thirty years old and wanted to use magic died unexpectedly, and when he woke up, he was reborn in another world. Named Theon, he had high hopes that there would be magic in another world, but there was no magic in that world. Theon became depressed and lethargic, but an event led him to discover the existence of magic. "That's right. If there is no magic, then I will make it myself."