Jonah could be an extraordinary hero. He doesn't want that though. The strange young man with a prosthetic right arm wants to live life freely and in order to do so picked up a living and mobile mansion as well as a crew of various spirits, demons, monsters, and other types of nonhuman beings. This is the story of how a young man from Earth manages to live an extraordinary yet enjoyable life as the lord of a mansion that goes wherever it feels like, and how his servants never fail to make his life interesting.