Tonkachi and Renge live on mysterious Hammer Island, a place where no human should be able to survive. The two are carpenters who build houses for the island's inhabitants, but what are their special powers? And what are their dreams? Construction soon begins on this megabuild of a battle fantasy story!

The one-shot revolved around Kugi, a young man and carpenter who takes on jobs to build homes for animals for a living. He lives in a sentient house named Two-by-Four, and they bicker often. One day, a duo of burglars show up whose specialty is to steal buildings, but Two-by-Four manages to beat them into submission. It turns out the duo were part of a bigger organization whose goal is to take back the "mythical living house." [ANN]