Jumping through a secret gateway from their pre-nuclear world, Ryan Cawdor and his survivalist group find themselves in a fallen nation that is shadowed by samurai rulers that threaten Cawdor's world. Original.
This one drew a good picture of a post apocalyptic Japan that went feudal again with samurai and all. Japanese history had always been interesting and I think their rituals and mannerisms have been displayed well (though maybe a bit too middle-ages). Good read.