here is a title I'm sure you are going to like.
It's called eternal sabbath
http://myanimelist.net/manga/344/Eternal_Sabbath
I read the first chapter and I gotta say this is going to fit all your needs.I read in other places that the atmosphere in this manga feels like that of death note. I was wondering if you read Yuutai Nova yet because that one is also good along with underdog