That Time I got reincarnated as… The Demon Lord’s butler?!

My life was normal: no friends, no wife, no family and a worthless job, just like everyone elses, a normal life... One day, I horribly died on an car accident. My reincarnation was a mess, and somehow I ended as the new Demon Lord’s butler. Now I should help her with her plans to rule over this country's monsters and people. Of course, as a former human, I'll be secrectly help them... as long as I can. My dream? Just to have a peacefull life once again...