Sally, the kind but mischievous princess of the Land of Magic, has developed an interest in the human world. Wanting to experience it for herself, she runs away and meets two girls her age—Yoshiko "Yocchan" Hanamura and Sumire Kasugano—at a department store. They quickly become friends and spend time at Sally's mansion, which she conjured with magic. The two girls realize they forgot something at the store, and despite it having closed for the night, they leave to fetch the item. Sally and her younger brother Cub, who had been sent by their parents to retrieve her, follow them and discover that they have been captured by a pair of thieves who were attempting to rob the store. Utilizing their magic, Sally and Cub drive the thieves away and rescue the girls, who remain unaware of Sally's powers. Attached to her new friends and the fun of the human world, Sally decides to stay, taking up the surname Yumeno and attending school with Yocchan and Sumire. Cub chooses to live with her and together they make a variety of new friends and go on various adventures, all the while spicing up their lives with magic. [Written by MAL Rewrite]

Ultra B (UB), is a small child from outer space who wears red sunglasses and has a star-shaped mole on his left cheek. It all began when UB's spaceship made an emergency landing in the forest. Lost and alone, UB was found by a young school boy named Michio. He was kind enough to take UB home for shelter, but only to learn that he was no ordinary child... but with supernatural powers! Thankful UB tries to use his special power to help Michio in trouble, but doesn’t mean that it always work out well. Especially, when UB sees a scary black cat, he loses control, and… (Source: TV Asahi)

Kuro is just an ordinary cat who only wants to protect his owners who are an old couple that can't fend for themselves. One day while on a date with his girlfriend Pooly who is a dog, he is kidnapped by an evil scientist and turned into a robot. Kuro somehow removes the chip that controlled him and notices that people get scared with his new robotic appearance and that he can now talk like a human. He decides to disguise himself with the skin of a stuffed toy and to continue living as a pet. (Source: ANN)