Long, long ago, there lived a mermaid princess named Lara. She was raised with love by her father, the king of sea and her sisters. One day, Lara fell in love with a human prince who lived on land. It was a forbidden love—one that was not allowed in the world of mermaids. Still, Lara journeyed to the surface. With a potion, given to her from the witch Grace, she became human. But the potion came at a cost—fail to find true love, and she would turn into foam and vanish into the ocean. Though she was a princess of the sea, Lara chose love. Yet, her wish went unfulfilled and she vanished into the sea. Two hundred years later, Lara awakens once more, in Lake Biwa to finally search for her true love. (Source: Crunchyroll)

After the events of the 1st series, Fenarinarsa continues to drift from Earth, so the King asks for help from the kingdom, Marinarsa, to send their daughter, Momo (Who is identical to the 1st one) to Earth to regain humanity's faith in their dreams.

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.

In this surreal comedy, the witch Tsukune-chan travels the countryside doling out just deserts, be they good or bad. (Source: AniDB)