It takes place in a futuristic world where a portal recently opened to a Monster Girl dimension. Some of the inhabitants decided to cross over, but to conform with society, they've transformed themselves into humans. Meanwhile, you've inherited a ton of debt, so you've come up with the idea to convince them to transform back, live on your farm, and sell their products on the open market. You'll be milking hucows, collecting harpy eggs, and riding unicorns (in multiple ways).