In the year 20XX, an alien pig prince who intended to inhabit a human body landed on Earth, only to discover that the person he planned to occupy had not yet been born. With nowhere else to go, the pig prince met Saiji and Rubi. Together they played a series of tricks on people, resulting in baldness, bad breath, headaches, emotional turmoil and ailments. The pranks caused confusion and prompted authorities to investigate phenomena.
