Nexus/Grand Order (OC x Harem)

Nexus came into Chaldea just to get into the job and try to put in effort to it. Now he's been transferred as the 48th Master candidate on saving the world, risking lives in an uncharted territory where anybody could die. Which just happened. Well it's not the first time Nexus experienced this. Question is how much it has in store for him...

By the way, this is the exact story from fanfic. I'm just putting it here hoping to get more recognition.
Also I changed the name, the title I changed was in my mind for a while and want to put it simple if that's cool.