Journey for the Forgotten Power

Haru (you can change the name) is born in a world where magic, demons, and technology exist, but unfortunately he was born without magic despite his late parents and grandparents all being known as a very powerful magic user, and because of that he left his hometown and chose to live alone. Now 7 years later he finally returned to his hometown again because his grandfather who is the only one left from his family had passed away. But when he arrived he learned the truth that he actually could use magic, but her grandfather sealed away his magic and changed his memory.