Usagi and her friends would have enjoyed the peaceful rest since their last battle, but they have been studying for their high school entrance exams! Unbeknownst to them, the evil Professor Tomoe and Kaolinite are ploting to conquer the world by harnessing a mysterious power found only in pure hearts. Dreams of a first kiss or honest feelings of love and admiration make innocent people targets for their sinister plan. As the Sailor Soldiers fight to stop the professor's deadly minions from stealing heart crystals, they are aided by two mysterious warriors, who have their own motives. Can they all set aside their differences to prevent a world catastrophe from occuring?