Magical DoReMi Episode 4: Everyone Becomes a Witch!
Episode 4 of 51 of Magical DoReMi, aired February 28, 1999, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Hazuki and Aiko find out Doremi's secret of being a witch apprentice after the stunt she pulls on Parents' Day, so they must also become witch apprentices to protect Doremi. The three girls redecorate the magic shop with a more cheerful design after Doremi accidentally destroys the shop.