After peacefully coexisting, Usagi Tsukino and her comrades are summoned to become Sailor Guardians- tasked with safeguarding the galaxy. As Sailor Moon, Usagi leads her companions to fight against two extraterrestrial invaders, An and Ail, who are utilizing human energy to revitalize the Makai Tree, putting Earth at risk. Failure to thwart the dangerous duo's plot would result in the destruction of the planet. While things are eventually resolved, a new predicament arises with the arrival of a girl from the future. She turns to Sailor Moon for help so as to save her loved ones, yet the vicious Black Moon Clan also covets this power to achieve their destructive objectives. In order to shield the universe and realize their predetermined destinies, Sailor Moon and her associates must take on these treacherous foes head-on and emerge triumphant.