Kenshin was an ordinary young man on earth, but he accidentally traveled to a different world of monsters and turned into the shadow of an elf girl Sylvie. This other world is full of all kinds of monsters. Fortunately, he is bound to the system and can slowly improve. Gradually, he adapts to this world and wins battles with monsters again and again and becomes the overlord. Can he return to Blue Star or die in the other world?
Fighting monsters and upgrading + interspersed with laughter (slightly funny) + another world + slight wits. (The system is just a foil, not a brainless way to defeat monsters. There will be micro-reversals)
