Turns out having a cat-shaped alien roommate leads to all sorts of interesting discoveries. An alien named Mumu is a survivor of a civil war that saw the destruction of his planet's scientists, leaving only its fools alive. The cat-shaped alien has infiltrated Earth, a planet with a lower level of civilization, to study their so-called "home appliances," which contain facets of all kinds of technological knowledge. From 5G to choosing the perfect rice cooker, Sakurako and her new alien roommate learn some surprising how-to tips about home appliances!