customize
survive
It's not just humans you'll need to worry about!
In single-player, everything you do in your world will determine your skills in the fantasy one; learn all you can because you'll be able to take what you know to the other world. They may have magic and demons running around, but they are stuck in the Modern & Contemporary Age.
You start off in a small town late for a job convention. After choosing a job, you will learn & train as much as you can, for it will determine your skills in the new fantasy world. You may have died or been transported to another world, but you keep all your past life memories. It will be necessary for your survival to craft advanced weapons, tools, buildings, etc.