Returning the Authority: Former Owner of the Body is Still in My Head

When Ed wakes up after an accident, he finds himself in a strange new world of primitive technology and magic. As he searches for a way to return home, he must also face the challenges of living as an eccentric aristocrat and restoring his family's lost wealth. But the greatest challenge comes from within: the original owner of the body still resides in Ed's mind. Can an advanced world engineer and a magical world noble get along in the same body?