Watch Rakudai Majo: Fuuka to Yami no Majo

Fuuka, a little witch, is training to be a better witch like her mother, a queen of Silver Castle. She is a lively girl and cares about her friends, but she gets into trouble sometimes. Karin, a princess of Green Castle, is Fuuka's best friend; and Chitose, a prince of Blue Castle, is her friend from childhood. Fuuka goes to the Wood of Wolf to look for a tunnel with them, but they find a hole instead. This is an exciting story of adventure and friendship.

(Source: POPLAR, edited)