Tokyopop famously made their fortunes on the back of shoujo manga back when they were still Mixx (...or sometimes Chix Comix. It took them a while to settle on Tokyopop). Of course, for every Sailor Moon they picked up, there were more obscure works like today's selection.
JULINE (Kakuto Komusume Juline), by Narumi Kakinouchi. First published in 1997 and first published in North America in 2001.
PLOT:
Juline is the heiress to the Kenga clan of ninjas, but she's more concerned with winner her handsome guardian's heart than any outside threat. Then a mysterious new clan called the Black Pearl starts stealing their members, a clan connected to both a mysterious, androgynous leader and the princely new girl at school. To discover the truth, Juline must team up with the other clans in town to investigate...presuming that they survive.