Balala Xiao Mo Xian: Feiyue Cai Ling Bao
English title: Balala the Faries: Over the Rainbow
Japanese title: 巴啦啦小魔仙之飞越彩灵堡
Alternative titles: Balala the Fairies: Flying Over Fort Crescent, Balala, Little Magic Fairy: Over the Rainbow, Balala the Fairies Season 4
Type: TV
Source: Original
Episodes: 26
Status: Finished Airing
Aired: Nov 13, 2016 to Dec 8, 2016
Broadcast: Sundays at 20:00 (JST)
Duration: 22 min per ep
Rating: PG - Children
Studios: Qianqi Animation
Producers: B.CMAY PICTURES, Alpha Group
Genres: Comedy, Fantasy
Themes: Mahou Shoujo

Not far from the Magical World of Fairy Castle, there is another Magical Kingdom called Colorful Castle. Which is a place full of color, joy and humor, just like a peaceful, carefree paradise... Until one day, at the edge of the Kingdom, There a dark gray island, where the owner of it, The Lord of black curse just woke up from sleep. In order to make his island to become more powerful, he decide to steal the "Color Magic Energy" of Colorful Castle for himself. 

The Lord sent his men, the Black Bean Soldiers, sneak into the colorful Kingdom, to steal the energy. Witnessing her own people been bullied, the princess of the Colorful Kingdom found herself had no strategy left to try, as herself had been cursed by the mysterious curse, and turn into a little pixie. But she would never thought, there will be three girl from the human world, to be on her side, together, they will dealing with the Lord of the black curse. Also, the peaceful and joyful atmosphere of the kingdom, is going to be changed along with the girls break in.

(Source: Mahou Shoujo Wikia)