From DrCoke at MangaHelpers:
Sayuri is a normal school girl during the day, but transforms into the Magical Sayu when evils shows its face. Lili is a trained and professional witch who has come to Japan on a mission to eradicate the evil forces that lie within the land. These two happen to end up in the same classroom in the same school. This haphazard witch duo sets out to free the world from various evil forces...