Beautiful Warrior Sailor Moon. Volume 3

Hardly has Sailor Moon and her warrior friends managed to achieve victory over the Dark Kingdom when a new calamity literally falls on their heads: an unfamiliar girl with the same pair of buns on her head as Usagi, who also calls herself Usagi! Who is this mysterious stranger and how is she connected to the new enemies of the sailor warriors - the Black Moon Society, who seem to be hunting for her?