Fate/Series: I have a simulated servant!

Louis died on Earth due to a truck accident, but he gains a system that tells him he can simulate lives and, in the end, turn those lives into heroes as long as the legend he creates is enough for him to become a heroic spirit. As his first simulation, he becomes a boy named Rémy in France. The cover is not mine. I have no rights to any of the characters other than my own.