Ojamajo Doremi (2005)

Doremi refers to herself as the "unluckiest bishoujo in the world". Her little sister that treats her like a child, her parents that fight almost every day and her crush is in love with another girl. Doremi aspires to become a witch, hoping that magic can solve all her problems. Doremi then finds a real witch, but after calling the witch out the witch is transformed into a green blob incapable of using magic. Blaming Doremi for the incident, the witch takes Doremi as an apprentice, hoping that despite Doremi's constant misuse of magic Doremi will become a witch someday. Doremi then recruits her two best friends as witch apprentices, and together they aim to pass the witch exams and become full fledged witches.