The older I get, the more I struggle with shojo manga. It's hard to maintain one's enthusiasm when faced with so many titles like this.
ST. DRAGON GIRL (Kiyoshi Seinto Doragon Gaaru), by Natsumi Matsumoto. First published in 1999 and first published in North America in 2008.
PLOT:
Momoka is a spirited (if somewhat hapless) young martial artist. At her side is Ryuga, a master of magic and Momoka's childhood best friend. When a mutual friend of theirs is threatened by a dragon king, Ryuga summons a dragon god that ends up getting sealed into Momoka. Her newfound power makes Momoka an attractive prospect for malicious spirits and humans alike, but Momoka's greatest challenge might be overcoming her reluctance to telling Ryuga how much she truly loves him.