From the introduction: Mizuryu Kei Land, a theme park that will one day be brought into existence by a struggling ero mangaka after he buys land in Texas, and finds a massive oil field after getting lost in the desert and almost dying! The theme of the park is, of course, sex! Thanks to an intense amount of devotion and an excessive amount of money that the director had for the project, the sex theme park managed to not only exist, but thrive, and to also change to world around it to be... More accommodating.