Arifureta - Demon King's Return

Nagumo Hajime, the Demon King of Earth, was summoned as Hero by a careless goddess. Like a demon king he is (somewhat mellowed out by the time on Earth), decided to rampage, sinking the quarter of land with some of his new creations. However, the goddess did not look kindly upon that, sending him back to the past, at the time of his summoning. Disclaimer: The original story does not belong to me. This work is fan-fiction of what -if story. Only OC belongs to me. (Due to not having read the LN and having been forever since I last read the original portion, there might be some inconsistencies. Please let me know as I will do my best to fix them.)