God Hunter from Another World

Is God a metaphysical concept? Or some kind of powerful creature? The protagonist travels to a different world more than ten years ago. While living, there are too many things that need to change. First, a girl who will become a super boss in the future must be rescued from her destined fate. What should I do if I encounter trouble on the road? See this dangling tentacle? It belonged to an ancient god, and the grass grew two feet high on the grave of the last person who saw it.