Mahoutsukai Precure!

Synopsis

Orba tries out a spell which ends up turning Mirai, Riko, and Kotoha into little children. As the Headmaster looks for a way to turn them back to normal, Mofurun is left in charge of the girls, who have trouble controlling their magic in their younger forms, while also trying to keep them a secret from Mirai's mother. Meanwhile, Spalda manages to find Batty and Gamets and has Orba resurrect them as well. While Batty sees no point in his revival and goes off on his own, Spalda and Gamets attack with a Seashell Yokubal, with Mofurun's determination to protect everyone prompting the Cures to transform, returning them to normal in the process. During the battle, Orba questions Kotoha over who she really is, but she manages to stand by her friends and defeat the Yokubal.

(Source: Wikipedia)