Tweeny Witches (2004)

Original title: 魔法少女隊アルス

Arusu believes in magic and it's power to do good in the world. Unfortunately for her, her fellow witches disagree, and use their powers for all sorts of neat tricks, like turning little sprites into their slaves. Realizing that this nightmare is a reality, Arusu sets out to change the ways of the witches, and gets up to some hilarious hijinks along the way.