Just Two Friends in Another World

With a title like that should I explain it?
Well, I will.
Our protagonist Rehabiri and his best friend Hirou are reincarnated to another world by God himself. For what reason? He was bored. Now promised to be overpowered in this new world they wake up in a field, they soon find want to learn more about this world and have a clear stance on war. What could this mean? Read to find out.