Genre: Probably Shoujo/Fantasy or magic
Type of media: TV show/OVA?
Characters: Mostly girls with one main heroine and a male protagonist living in modern times (school attendance was probably involved)
Plot: The story revolves around girls with "spirits" they use to fight. The main heroine was using a "fire spirit" but only after she accepted it in one of the episodes. There also was a smaller girl, which was firstly her rival but they became friends after some time. The little girl was using a huge sword and in one scene in park lot she cut a car in half. Apart from the girls there is also a love story involved with the main heroine and a boy. In the end they have to fight some evil villain.
Time range: I watched it around year 2006?
I know this is as vague as it can get, but if someone could recognize it - it would be much appreciated!